Average Weather in Glendale Arizona, United States

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2. United States
3. Arizona
4. Maricopa County
5. Glendale

In Glendale, the summers are sweltering and dry, the winters are cool, and it is mostly clear year round. Over the course of the year, the temperature typically varies from 44°F to 106°F and is rarely below 36°F or above 112°F.

The hot season lasts for 3.6 months, from May 30 to September 19, with an average daily high temperature above 98°F. The hottest day of the year is July 5, with an average high of 106°F and low of 82°F.

The cool season lasts for 3.2 months, from November 20 to February 27, with an average daily high temperature below 73°F. The coldest day of the year is December 27, with an average low of 44°F and high of 65°F.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

In Glendale, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in Glendale begins around April 8 and lasts for 3.2 months, ending around July 13. On June 14, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 86% of the time, and overcast or mostly cloudy 14% of the time.

The cloudier part of the year begins around July 13 and lasts for 8.8 months, ending around April 8. On February 19, the cloudiest day of the year, the sky is overcast or mostly cloudy 38% of the time, and clear, mostly clear, or partly cloudy 62% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Glendale varies throughout the year.

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. The chance of a wet day peaks at 19% on August 13.

The drier season lasts 3.5 months, from March 20 to July 6. The smallest chance of a wet day is 0% on June 13.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 19% on August 13.

Rainfall

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. Glendale experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 8.7 months, from July 10 to April 2, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 19, with an average total accumulation of 1.1 inches.

The rainless period of the year lasts for 3.3 months, from April 2 to July 10. The least rain falls around June 6, with and average total accumulation of 0.1 inches.

The length of the day in Glendale varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 56 minutes of daylight; the longest day is June 21, with 14 hours, 23 minutes of daylight.

The earliest sunrise is at 5:18 AM on June 12, and the latest sunrise is 2 hours, 16 minutes later at 7:33 AM on January 7. 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.

Daylight saving time (DST) is not observed in Glendale during 2017.

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

Glendale experiences some seasonal variation in the perceived humidity.

The muggier period of the year lasts for 2.7 months, from June 30 to September 22, during which time the comfort level is muggy, oppressive, or miserable at least 6% of the time. The muggiest day of the year is August 14, with muggy conditions 23% of the time.

The least muggy day of the year is December 8, when muggy conditions are essentially unheard of.

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Glendale experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 8.7 months, from October 21 to July 13, with average wind speeds of more than 3.6 miles per hour. The windiest day of the year is April 30, with an average hourly wind speed of 4.1 miles per hour.

The calmer time of year lasts for 3.3 months, from July 13 to October 21. The calmest day of the year is August 16, with an average hourly wind speed of 3.1 miles per hour.

The predominant average hourly wind direction in Glendale varies throughout the year.

The wind is most often from the west for 6.6 months, from March 3 to September 21, with a peak percentage of 53% on July 6. The wind is most often from the east for 5.4 months, from September 21 to March 3, with a peak percentage of 51% on January 1.

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. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

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. The brightest day of the year is June 13, with an average of 8.5 kWh.

The darker period of the year lasts for 3.2 months, from November 5 to February 10, with an average daily incident shortwave energy per square meter below 4.2 kWh. The darkest day of the year is December 24, with an average of 3.1 kWh.

For the purposes of this report, the geographical coordinates of Glendale are 33.539 deg latitude, -112.186 deg longitude, and 1,145 ft elevation.

The topography within 2 miles of Glendale is essentially flat, with a maximum elevation change of 82 feet and an average elevation above sea level of 1,148 feet. Within 10 miles is essentially flat (1,542 feet). Within 50 miles contains very significant variations in elevation (6,952 feet).

The area within 2 miles of Glendale is covered by artificial surfaces (77%) and shrubs (23%), within 10 miles by artificial surfaces (59%) and shrubs (36%), and within 50 miles by shrubs (86%).

This report illustrates the typical weather in Glendale, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Glendale.

For each station, the records are corrected for the elevation difference between that station and Glendale according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at Glendale is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Glendale and a given station.

The stations contributing to this reconstruction are: Luke Air Force Base (41%, 17 kilometers, west); Phoenix-Deer Valley Airport (29%, 19 kilometers, northeast); and Phoenix Sky Harbor International Airport (30%, 21 kilometers, southeast).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . 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.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.