Lower dew points feel drier and higher dew points feel more humid. . The cloudiest month of the year in Phoenix is February, during which on average the sky is overcast or mostly cloudy 37% of the time. The wettest month is August with an average of 32mm of rain .. Average Temperature: Phoenix Loading weather data. The month with the least rain in Phoenix is June, with an average rainfall of 0.1 inches. These transition months should be the least affected by large-scale weather disturbances since they are in between the precipitation seasons. With our intense sunshine and lack of rain, the summer temperatures start to heat up in late May and it's hot through the middle of September. If we have an unusually dry summer, it might even stay extremely hot through September and into early October. In the strictest sense, a "normal" of a particular variable (e.g., temperature) is defined as the 30-year average. You will find this type of climate in certain cities that sit between 20 degrees and 33 degrees north and south latitudes. While this is classified as a rainfall season, there can be periods of a month or more in this or any other season when practically no precipitation occurs. All NOAA. Throughout the year, The Valley averages temperatures about 5 to 10 degrees warmer for both our highs and our lows. The least muggy day of the year is March 5, when muggy conditions are essentially unheard of. The windier part of the year lasts for 8.7 months, from October 22 to July 13, with average wind speeds of more than 6.6 miles per hour. 2016. The summer of 2020 was especially hot with 51 days of temperatures above 110 degrees. Weather data is prone to errors, outages, and other defects. And now you know why Phoenix is nicknamed, "The Valley of the Sun. December is the coolest month with highs around 66 and lows in the mid-40s. How do people survive the summer? Our beach/pool temperature score is 0 for perceived temperatures below 65F, rising linearly to 9 for 75F, to 10 for 82F, falling linearly to 9 for 90F, and to 1 for 100F or hotter. Three years later in June 1916, the office moved to the Water Users Building on the southeast corner of2nd Avenueand Van Buren. We decided to examine thePhoenix,Arizona, weather records from 1896-1984 to see if there has been a change in the humidity of thePhoenixurban area. The muggier period of the year lasts for 2.8 months, from June 30 to September 24, during which time the comfort level is muggy, oppressive, or miserable at least 6% of the time. Average low temperature is 83F (28C). Monthly averages Phoenix Longitude: -112.013, Latitude: 33.4311 Average weather Phoenix, AZ - 85034. The brighter period of the year lasts for 2.9 months, from April 19 to July 16, with an average daily incident shortwave energy per square meter above 7.4 kWh. Most of the typical sunny summer days in the high country ofArizonafall into the very warm category. The daily amounts of solar energy that are received at the top of the atmosphere (the extra-terrestrial radiation, or ETR)isshown in curve A. The average high temperature in Phoenix now climbs to 91.9 degrees, with evening hours reaching 66.3 degrees. What was the weather like on your birthday or another date in history? The drier season lasts 3.5 months, from March 20 to July 6. For each station, the records are corrected for the elevation difference between that station and Phoenix according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. In 2022, the shortest day is December 21, with 9 hours, 56 minutes of daylight; the longest day is June 21, with 14 hours, 22 minutes of daylight. Everything else here is based on 1991 to 2020 weather. With more than 300 days of sunshine a year, you will find it's a wonderful place to visit most months. The wetter season lasts 8.5 months, from July 6 to March 20, with a greater than 10% chance of a given day being a wet day. As you can see from the video above, restaurants with outdoor seating aren't usually open during the day, but they do mist water on their outdoor areas for evening seating. A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. These values of relative humidity are averages of the five years. During the thunderstorm season in July and August, there are often local, strong, gusty winds with considerable blowing dust. The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands. However, many scientists have shown that cities usually act to decrease moisture levels in the atmosphere. In 1901 the office was moved to the southwest corner of 1st Avenue and Adams where it remained until it moved into the Federal Building on the southwest corner of 1st Avenue and Van Buren in March 1913. Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. July is the hottest month with average highs around 106 degrees (41 C). New Year's Day Average High Temperature: 64 Average Low Temperature: 40 Average Precipitation: .01 inch President's Day Average High Temperature: 71 Phoenix's coldest days of the year usually occur in late December when the daily maximum temperature averages 65 degrees Fahrenheit (18 degrees Celsius) and the minimum averages 44 F (7 C). Shortwave radiation includes visible light and ultraviolet radiation. The coldest month of the year in Phoenix is December, with an average low of 46F and high of 66F. The calmest month of the year in Phoenix is August, with an average hourly wind speed of 5.8 miles per hour. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands. While the temperatures are hotter here, it might feel more pleasant than Florida if you don't like humidity. Some resorts and apartment complexes will keep their pools open throughout the year. Arizona has hotter temperatures than Florida in the summer. You will see Phoenix temperatures falling in October and even more in November. The calmer time of year lasts for 3.3 months, from July 13 to October 22. The valley floor, in general, is rather free of strong wind. The thin dotted lines are the corresponding average perceived temperatures. From late September to late May, you will find the temperatures are quite pleasant with sunny days and cool nights. The famous landmark ofCamelbackMountainlies 6 miles to the north-northeast and rises to 2700 feet MSL. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. What month does it start to cool down? Monthly: 1981-2010 normals. Data is available up to November 5, 2022. What is the weather like in Phoenix during the Fall? How many 100 degree days does Phoenix get? Our analyses showed that trend was not the source of non-random inter-annual variation in June (or any other month). Throughout the year, The Valley averages temperatures about 5 to 10 degrees warmer for both our highs and our lows. In the desert southwest, however, summer is the most undesirable time of the year. It is interesting to note that with high moisture content, withhumiditiesin the 30% and 40% range, the temperature never reached over 105 degrees. The hottest month of the year in Phoenix is July, with an average high of 106F and low of 85F. During the spring, skies are also predominately sunny with warm temperatures during the day and mild pleasant evenings. Commerce now included the mushrooming aviation industry and in 1940, to meet this partial change in emphasis, the Weather Bureau was transferred from the Department of Agriculture to the Department of Commerce where it remains today. Sign up today for our monthly newsletter with tips to help you explore the best of Phoenix. Over the course of the year, the temperature typically varies from 45F to 107F and is rarely below 37F or above 112F. May is a great month to visit local parks and recreation with available swimming pools and kayaking. This marks 100 years of continuous weather records forPhoenix. The darker period of the year lasts for 3.1 months, from November 5 to February 10, with an average daily incident shortwave energy per square meter below 4.2 kWh. Data in this revision are for the period January 1, 1896 through December 31, 1995. WeatherSpark.com. You can find even more about the Phoenix weather in fall below. The hottest day on record was on June 26, 1990 when the temperature reached a scorching 122 degrees. 8.03 inch The hottest month of the year in Phoenix is July, with an average high of 106F and low of 85F. Houston, TX 66 F Cloudy. 36 days: Annual hours of sunshine: 3832 hours: Average annual precip. Yet air temperature is the result of many other climatic elements. If you are visiting from the north where temperatures are at or below freezing though, you will probably love it as a fun winter activity. Sunshine inPhoenixarea averages 86 percent of possible, ranging from a minimum monthly average of around 78 percent in January and December to a maximum of 94 percent in June. Summer thundershowers seldom occur in the valley before evening. In the summer months, we average about 104 - 106 degrees each day. In the 1800s when communications in theUnited Stateswere improved by the development of the railroads and telegraph, the practice of predicting weather from purely local signs and the haphazard measuring of meteorological phenomena began to decline. January 31, 2009 at 5:31 am . Multiple locations were found. Most of these were in July (16) and August (25). Arizona, United States. It remained there until September 1924 when it moved to theEllisBuildingat2nd AvenueandMonroe. The first occurs during the winter months from November through March when the area is subjected to occasional storms from thePacific Ocean. The evenings also don't cool down too much these months, so you can still get up before the sunrises to start your hike or golf game without having to add too many layers. 75.05 F. The dew point temperature is a better indicator of the amount of moisture in the air, which is the major contributor to human discomfort. The temperatures start to cool down quite a bit in the fall. Another reason we love the heat compared to the cold is that you can also get up really early and enjoy some outdoor time before it gets too hot. The horizontal axis is the day of the year and the vertical axis is the hour of the day. The chance of wet days in Phoenix varies throughout the year. . Aram and I get this question quite a bit. Total days per year on average when the temperature in Phoenix reached at least 70 or 90 F; Decade 70 F 21 C 90 F 32 C; 2010s: 311: 175: 2000s: 297: 176: 1990s: 294: 169: 1980s: 301: 173: 1970s: 294: 168: 1960s: 283: 162: 1950s: 294: 163 The Phoenix temperatures were extremely hot due to a lack of rain that summer. The increased water vapor in the atmosphere is due to a shift in the winds from a predominantly westerly direction to a southerly direction, the so-called Arizona Monsoon. These statistical procedures allow us to make conclusions regarding any trends, cycles, or discontinuities in the moisture records. It is sunny more than 300 days every year. Office of Climatology,ArizonaStateUniversity. We chose relative humidity and dew point temperatures for statistical analysis. The ten-year average daily receipt of solar energy atPhoenixis shown in curve D. Some of the energy reaching the earths surface is reflected back toward space by the earth itself, some is used to evaporate water, and the remainder warms the air. We chose six different relatively sophisticated statistical techniques to analyze the time series patterns in the atmospheric moisture data. The figure below shows you a compact characterization of the entire year of hourly average temperatures. But it was not until the late 1860s that mounting public interest in a national weather service culminated in the signing into law by President Grant on February 9, 1870, of a resolution providing for meteorological observations at all military stations within theUnited States. The large drop in energy receipt during July is directly traceable to the increase in cloudiness (curve E) during this period. Within 50 miles contains very significant variations in elevation (6,909 feet). NWS Phoenix2727 E Washington StNWS PAB 1TAPhoenix, AZ 85034(602) 275-0073Comments? The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands. The number of hours during which the Sun is visible (black line). Things will start to cool down in the winter. National Oceanic and Atmospheric Administration The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands. In comparison during this time, we get about 3 inches of rain and Florida gets about 32 inches of rain. Personally, I would say it's unbearable outside in the summer, but there are plenty of amazing things to do inside that keep us busy as we wait for the cooler temperatures the rest of the year. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. Just a few of the other cities with a hot desert climate include Lima, Peru; Cairo, Egypt; Dubai, UAE; and Baghdad, Iraq. Currently: 76 F. We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. The flattening of the temperature curve during August is due to the energy absorbed by the enhanced rainfall during that time. The hot season lasts for 3.7 months, from May 29 to September 20, with an average daily high temperature above 98F. . All the temperature data were collected at Sky Harbor International Airport near downtown Phoenix. You can drill down from year to month and even day level reports by clicking on the graphs. Summarized here are the temperatures extending over seven decades at Phoenix, Arizona. Based on this score, the best times of year to visit Phoenix for hot-weather activities are from late May to early July and from late August to early October, with a peak score in the second week of June. It wasnt until 1891, when theU.S. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. CityRating.com offers the average Phoenix temperature chart that displays the annual and monthly temperatures for Phoenix and dozens of other . The average temperatures for the Phoenix summer weather are between 104 and 106 degrees. HIGHEST MAXIMUM AND LOWEST MINIMUM BY MONTHS AND DAY AND YEAR OF OCCURRENCE 1896-2008 What's The Average High Temp in Phoenix? Ms. Brazel and Mr.Ballingsresearch paper, The Myth of Increasing Moisture Levels inPhoenix, is also included in this Technical Memorandum. The first Weather Bureau Office to open inArizonawas inYumawhere the duties were transferred from the Army at FortYumain July 1891. During the spring months southwest and west winds predominate and are associated with the passage of low-pressure troughs. In support of this new means of transportation, another Weather Bureau office was established atSkyHarborAirporton May 2, 1933, and observations were taken there also until July 1935 when Department of Commerce radio operators took over the program. Please review our full terms contained on our Terms of Service page. You can still enjoy a little time in the shade during the day, but you need to drink plenty of water and not be outside too long. Highest Temperature in Phoenix for Each Year. 86.7 F. Solar elevation and azimuth over the course of the year 2022. By Harold Bulk, Office of Climatology,ArizonaStateUniversity. The predominant average hourly wind direction in Phoenix varies throughout the year. Sorry, the location you searched for was not found. Daily total Horizontal Solar Energy Receipts, 1971-1980. The shaded overlays indicate night and civil twilight. Find additional information on the Phoenix weather in winter below. NWS How Many Rainy Days a year are there in Phoenix? For instance the 1990s includes weather measurements from Jan 1, 1990 to Dec 31, 1999. Since it is almost impossible to drive anywhere during a snowstorm in the winter, we both agree with him 100%. Curve B is the average daily temperature atPhoenix. The Bureau directed its attention mainly toward establishing a network of field stations. Curve C represents the amount of energy that can reachPhoenixon a clear, dry day. For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. 8.04 inches. The stations contributing to this reconstruction are: To get a sense of how much these sources agree with each other, you can view a comparison of Phoenix and the stations that contribute to our estimates of its temperature history and climate. Is Phoenix hotter than Las Vegas? Faced with the growth of public interest, civic pride and the need to provide the best coverage for its forecasting and warning services with limited funds, the Weather Bureau could only slowly grant requests to establish weather stations in a rapidly expanding Nation. Winter is mild with temperatures dipping down into the mid-40s overnight. The estimated value at Phoenix is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Phoenix and a given station. The chart also gives the heat syndrome for each classification. We are the only large city in the US with this climate. Due to our climate, we also get very little rain throughout the year. This is also the time of year when you start to see those from the north make their annual migration to the south. Each decade covers a standard 10-year range. TheSuperstitionMountainsare approximately 35 miles to the east and rise to 5000 feet MSL. NOAA, EDIS, Asheville, North Carolina, 1971-1980. Is Arizona hotter than Florida? The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day). This is especially true during much of July and August when the atmosphere becomes laden with tropical moisture. Author: Dr. Robert Durrenburger. The coldest day on record was on January 5, 1950 when it dipped down to a chilly 17 degrees. The spring and fall months are generally dry, although precipitation in substantial amounts has fallen occasionally during every month of the year. Also shown is the ten-year average daily precipitation atPhoenix(curve G). There are two separate rainfall seasons. It's hot and the sun is intense, so we stay inside, or go to a museum or a movie, but we don't go outside and walk around much. Days of Hot Weather in Phoenix Nearly every day during summer, the temperature in Phoenix tops 99 F. Spring in Phoenix is amazing: In March, temperatures warm up to average in the mid-70s. Our personal favorite months are October, November, March, and April. The autumn season, beginning during the latter part of September, is characterized by sudden changes in temperature. The wind is most often from the east for 5.4 months, from September 23 to March 3, with a peak percentage of 53% on January 1. The shaded overlays indicate night and civil twilight. Is Arizona heat unbearable? Time zones for airports and weather stations are provided by AskGeo.com . You may be wondering if you can feel the difference? But, since it is a little further north, they have just slightly cooler temperatures. At night, you will find the temperatures cool down a bit with overnight lows around 80. The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year. Overnight temperatures also range from around 77 in September down to the mid-50s in November. The central floor of theSalt RiverValleyis irrigated by water from dams built on theSalt Riversystem. Within 10 miles is essentially flat (1,722 feet). The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than. Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures ( 32F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere). In Phoenix, the summers are sweltering and dry, the winters are cool, and it is mostly clear year round. This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader. The levels display a peak in the 1920s and a pronounced minimum in the 1970s and 1980s. TheSalt RiverMountains, orSouthMountainsas they are commonly called, are located 6 miles to the south and rise to 2600 feet MSL. January is about the same and overnight lows in February are around 50. Winter in Phoenix is moderate during the day and cool overnight. Daytime temperatures are high throughout the summer months. In Phoenix, there are 163.2 days annually when the high temperature is over 90, which is hotter than most places in Arizona. You will find temperatures dip about 20 degrees overnight. The monthly averages are based on daily values taken at 5 a.m. and 5 p.m. The prolonged summer head with maximum temperatures generally between 105 and 110 degrees in thePhoenixarea causes some degree of fatigue in most people. The systematic variations in June were found to be related in several significant cycles in the data. As most of the U.S. stays inside in the winter, we in Arizona are the opposite and stay inside during the summer. The beach/pool score favors clear, rainless days with perceived temperatures between 75F and 90F. Listed for every decade from the 1950s to the 2010s are averages for maximum and minimum daily temperatures in degrees Fahrenheit and Celsius. Please Contact Us. Nighttime temperatures frequently drop below freezing during the three coldest months, but the afternoons are usually sunny and warm. Home | Privacy & Cookies | Contact | About. The percentage of time spent in various temperature bands. The nights are also a touch warmer and only dip down to around 60. The average hourly temperature, color coded into bands. National Weather Service How Many Inches of Rain per year does Phoenix get ? To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. A date with a plus sign beside it means it was that hot on at least one other day earlier that year. NOAA National Centers for Environmental Information. The clearer part of the year in Phoenix begins around April 9 and lasts for 3.1 months, ending around July 11. Copyright | PhoenixUncovered.com | Privacy Policy. These winds generally come from a northeasterly to southeasterly direction. The thin dotted line is the corresponding average snowfall. The yearly averages are based on the averages of the twelve months. In April, it warms up a little bit more with average highs in the mid-80s. The weather is warm and sunny for most of the year, making it perfect for outdoor activities. Areas with milder temperatures around the edges of the valley are utilized by these crops. Average lows in December are in the mid-40s. This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid. Our tourism temperature score is 0 for perceived temperatures below 50F, rising linearly to 9 for 65F, to 10 for 75F, falling linearly to 9 for 80F, and to 1 for 90F or hotter. June - June is among the hottest months of the year, with the average high temperature in Phoenix being around 102.0 degrees. One word - HOT! For example, the average temperature normal in January for Phoenix would be computed by taking the average of the 30 January values of monthly averaged temperatures from 1991 to 2020. The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. You can easily become dehydrated or sunburnt unless you plan ahead. Scattered clouds. Records had been kept inPhoenixby the Signal Service beginning on January 28, 1876, and Signal Service personnel continued to take observations until they transferred the station on the corner of Center andWashingtonStreets to the Weather Bureau on August 6, 1895. Daily low temperatures increase by 9F, from 74F to 83F, rarely falling below 67F or exceeding 88F. What is the winter like in Phoenix? Most of Florida is in a humid subtropical climate, which means they get a LOT of rain during the months of May to October. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 19% on August 4. Daily high temperatures increase by 7F, from 99F to 106F, rarely falling below 91F or exceeding 112F. In Phoenix, there are 4 comfortable months with high temperatures in the range of 70-85. US Dept of Commerce You will find that September is still warm with highs averaging just below or around 100 throughout the month. Reitan, C.H., 1960: Distribution ofPrecipitableWater Vapor over the Continental United States. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. You're permitted to use this graph as long as you provide prominent attribution with a link back close to the use of the graph. The year's hottest days are normally in late June through the first half of July. The rainless period of the year lasts for 3.2 months, from April 3 to July 9. Please wait Phoenix weather is slightly hotter than Las Vegas. From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night. More is absorbed by water vapor in the air, and even the atmosphere itself will scatter a portion of the solar energy back to space as well as absorb a portion. This law provided for the distribution of meteorological information in the interest of agriculture and commerce as one of the Weather Bureaus major functions. Read on for more details about the weather all year including tips on what to pack for each season and month. In August, the average high temperature drops back down to 104F (40C). The length of the day in Phoenix varies significantly over the course of the year. Average temperature is the most popular factor that people take into consideration when looking for the best city to live in. Weather Bureau was established, that development of reporting stations proceeded with cautious economy. They are out there for the temperature in Fahrenheit, but good luck finding anything in Celsius. It features all historical weather data series we have available, including the Phoenix temperature history for 2022. The earliest sunset is at 5:20 PM on December 4, and the latest sunset is 2 hours, 22 minutes later at 7:42 PM on June 29. Snowfall occurs very rarely in theSalt RiverValley, while light snows occasionally fall in the higher mountains surrounding the valley. And trust us, once you visit Phoenix, you will also. Weather in March How cold does it get in the winter? Temperatures in Phoenix are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. Throughout the year there are periods, often several days in length, in which winds remain under 10 miles per hour. It is seen that the largest average daily receipts occur in July and August. The black isolines are contours of constant solar elevation. Honestly, we think Jill's dad Bill is a genius. The average temperature of the coldest month (December) is of 13.2 C (55.8 F), that of the warmest month (July) is of 35.3 C (95.5 F). The latitude for the valley is around 33 degrees north. In October 1970, the name was changed to the National Weather Service, and it became an integral part of the National Oceanic and Atmospheric Administration (NOAA). The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. Phoenixis located in about the center of theSalt RiverValley, a broad, oval-shaped, nearly flat plain. 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For maximum and minimum daily temperatures in Phoenix is December, with an average precipitation rate a Theellisbuildingat2Nd AvenueandMonroe July 5, 1950 when it dipped down to 104F ( 40C ) Midwest! The high temperature is marginal for some types of crops weather in winter below accuracy or suitability for any.. Vary significantly depending on the actual temperature and humidity, the average degree! Cap of 86F location is the most important is the result of primarily the energy.: 3832 hours: average annual precip high of 105 or 106 degrees ( 41 C. Higher dew points were somewhat surprising great month to visit most months remain under 10 is Less spectacularly so ) July ( 16 ) and blue bars ( new Moons ) key Mr.Ballingsresearch paper, the warmest month, the temperatures start to cool down in the summer to a 17, or a snow/sleet storm the National weather Service Forecast Office, Phoenix, you will the. 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