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Average Weather in December in Phoenix Arizona, United States

In Phoenix, the month of December is characterized by gradually falling daily high temperatures, with daily highs decreasing by 4°F, from 70°F to 66°F over the course of the month, and rarely exceeding 78°F or dropping below 57°F. The lowest daily average high temperature is 65°F on December 26.

Daily low temperatures decrease by 3°F, from 49°F to 45°F, rarely falling below 37°F or exceeding 56°F. The lowest daily average low temperature is 45°F on December 28.

For reference, on July 5, the hottest day of the year, temperatures in Phoenix typically range from 84°F to 107°F, while on December 28, the coldest day of the year, they range from 45°F to 65°F.

Average High and Low Temperature in December

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

Average Hourly Temperature in December

Average Hourly Temperature in December in Phoenix18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMNovJanwarmcoldcoolcomfortable
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < very cold < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.


The month of December in Phoenix experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 31% to 35%. The highest chance of overcast or mostly cloudy conditions is 36% on December 28.

The clearest day of the month is December 1, with clear, mostly clear, or partly cloudy conditions 69% of the time.

For reference, on February 19, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 38%, while on June 14, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 86%.

Cloud Cover Categories in December

Cloud Cover Categories in December in Phoenix1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJanJun 1486%Jun 1486%Dec 169%Dec 169%Dec 3164%Dec 3164%Dec 1168%Dec 1168%Dec 2165%Dec 2165%mostly clearpartly cloudyclearovercastmostly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.


A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Phoenix, the chance of a wet day over the course of December is essentially constant, remaining around 10% throughout.

For reference, the year's highest daily chance of a wet day is 19% on August 13, and its lowest chance is 1% on June 14.

Probability of Precipitation in December

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).


To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during December in Phoenix is essentially constant, remaining about 1.0 inches throughout, and rarely exceeding 2.7 inches.

Average Monthly Rainfall in December

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. The thin dotted line is the corresponding average liquid-equivalent snowfall.


Over the course of December in Phoenix, the length of the day is essentially constant. The shortest day of the month is December 20, with 9 hours, 56 minutes of daylight and the longest day is December 1, with 10 hours, 6 minutes of daylight.

Hours of Daylight and Twilight in December

Hours of Daylight and Twilight in December in Phoenix1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrNovJanDec 219 hr, 56 minDec 219 hr, 56 minnightnightdaydayDec 110 hr, 6 minDec 110 hr, 6 min
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month in Phoenix is 7:14 AM on December 1 and the latest sunrise is 18 minutes later at 7:32 AM on December 31.

The earliest sunset is 5:20 PM on December 4 and the latest sunset is 11 minutes later at 5:30 PM on December 31.

Daylight saving time is not observed in Phoenix during 2017.

For reference, on June 21, the longest day of the year, the Sun rises at 5:19 AM and sets 14 hours, 22 minutes later, at 7:41 PM, while on December 21, the shortest day of the year, it rises at 7:28 AM and sets 9 hours, 56 minutes later, at 5:24 PM.

Sunrise & Sunset with Twilight in December

The solar day over the course of December. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.


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.

The chance that a given day will be muggy in Phoenix is essentially constant during December, remaining around 0% throughout.

For reference, on August 14, the muggiest day of the year, there are muggy conditions 24% of the time, while on November 4, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in December

The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.


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 Phoenix is essentially constant during December, remaining within 0.1 miles per hour of 6.8 miles per hour throughout.

For reference, on April 30, the windiest day of the year, the daily average wind speed is 7.5 miles per hour, while on August 16, the calmest day of the year, the daily average wind speed is 5.7 miles per hour.

The lowest daily average wind speed during December is 6.7 miles per hour on December 17.

Average Wind Speed in December

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The hourly average wind direction in Phoenix throughout December is predominantly from the east, with a peak proportion of 53% on December 30.

Wind Direction in December

Wind Direction in December in Phoenix1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%NovJaneastwestsouthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Solar Energy

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 in Phoenix is essentially constant during December, remaining within 0.1 kWh of 3.3 kWh throughout.

The lowest average daily incident shortwave solar energy during December is 3.1 kWh on December 24.

Average Daily Incident Shortwave Solar Energy in December

Average Daily Incident Shortwave Solar Energy in December in Phoenix1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310.0 kWh0.5 kWh1.0 kWh1.5 kWh2.0 kWh2.5 kWh3.0 kWh3.5 kWh4.0 kWh4.5 kWh5.0 kWhNovJanDec 243.1 kWhDec 243.1 kWhDec 13.4 kWhDec 13.4 kWhDec 113.2 kWhDec 113.2 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.


For the purposes of this report, the geographical coordinates of Phoenix are 33.448 deg latitude, -112.074 deg longitude, and 1,086 ft elevation.

The topography within 2 miles of Phoenix is essentially flat, with a maximum elevation change of 56 feet and an average elevation above sea level of 1,082 feet. Within 10 miles is essentially flat (1,722 feet). Within 50 miles contains very significant variations in elevation (6,909 feet).

The area within 2 miles of Phoenix is covered by artificial surfaces (52%) and shrubs (48%), within 10 miles by artificial surfaces (51%) and shrubs (44%), and within 50 miles by shrubs (85%).

Data Sources

This report illustrates the typical weather in Phoenix year round, 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 Phoenix.

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.

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 stations contributing to this reconstruction are: Phoenix Sky Harbor International Airport (81%, 7 kilometers, east); Phoenix-Deer Valley Airport (9%, 27 kilometers, north); and Luke Air Force Base (9%, 29 kilometers, northwest).

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.


The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. 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.