December weather forecast
Arizona, USA

December in Arizona is a month of contrasts, where the south remains relatively mild while the northern areas feel the winter's cold grip. The month ushers in the colder season, and with it comes a range of weather experiences depending on the region.

The southern desert areas, including cities like Phoenix, maintain a mild climate even in December. Daytime temperatures generally lie between 65°F (18.3°C) and 75°F (23.9°C), making it quite pleasant for various activities. However, nights introduce a cooler feel, with temperatures typically ranging from 45°F (7.2°C) to 55°F (12.8°C). Rain events can occasionally punctuate the mostly clear skies, but they remain infrequent.

In stark contrast, the northern highlands and areas like Flagstaff fully enter the winter mode. Day temperatures often oscillate between 35°F (1.7°C) and 45°F (7.2°C). Nights can be significantly colder, sometimes plunging to between 15°F (-9.4°C) and 25°F (-3.9°C). Snow becomes a more common sight, particularly in the elevated regions, lending a white blanket to the landscape. The snow-capped peaks and frosty mornings encapsulate the winter feel of the region.

When juxtaposed with November, December solidifies its position as the beginning of the winter season in Arizona. The differences in temperatures between the southern and northern regions become more pronounced, showcasing the state's diverse climate. As December progresses, the chill deepens, setting the stage for the heart of winter in the subsequent months.

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• Phoenix - December »
  December is the most humid month with an average relative humidity of 43%. The month with the lowest UV index is December, with an average maximum UV index of 3.
• Tucson - December »
  With an average relative humidity of 45%, December is the most humid month in Tucson, Arizona. December, on average, is the coldest month in Tucson registering a high temperature of 60.8°F (16°C) and a low of 43°F (6.1°C).
• Mesa - December »
  December proves to be the coldest month in Mesa, recording an average maximum temperature of 62.4°F (16.9°C) and a minimum temperature of 46.6°F (8.1°C). As the end-of-year month arrives, December's weather in Mesa, Arizona presents a full-fledged winter scenario.
• Chandler - December »
  In Chandler during December, the rain falls for 6.7 days and regularly aggregates up to 0.91" (23mm) of precipitation. December is the most humid month in Chandler with an average relative humidity of 44%.
• Scottsdale - December »
  The most humid month in Scottsdale is December, with an average relative humidity of 44%. December is the most humid month in Scottsdale, with an average relative humidity of 44%.
• Glendale - December »
  With an average of 10h and 0min of daylight, December has the shortest days of the year in Glendale. December has the shortest days of the year in Glendale, with an average of 10h and 0min of daylight.
• Gilbert - December »
  December is the coldest month in Gilbert with the temperature often reaching an average high of 62.4°F (16.9°C) and an average low of 46.6°F (8.1°C). In Gilbert, the month of December is known for its lowest average temperatures, reaching a high of 62.4°F (16.9°C) and a low of 46.6°F (8.1°C).
• Tempe - December »
  With a decent measure of almost 0.87" (22mm) of rain spread over 6.5 days, December wraps up the year with a semblance of a mild winter for Tempe. With an average of 10h and 0min of daylight, December has the shortest days of the year in Tempe, Arizona.
• Peoria - December »
  December, with average temperatures reaching a high of 61.9°F (16.6°C) and a low of 46.8°F (8.2°C), is the coldest month in Peoria. December is the most humid month in Peoria, with an average relative humidity of 43%.
• Surprise - December »
  With an average of 10h and 0min of daylight, December has the shortest days of the year in Surprise, Arizona. Surprise's coldest month, December, registers temperatures that range from a high of 61.7°F (16.5°C) to a low of 46°F (7.8°C).
• Yuma - December »
  December is the coldest month in Yuma exhibiting average temperatures of 66°F (18.9°C) at the peak and 50.5°F (10.3°C) at the base. The month with the shortest days in Yuma, Arizona, is December, with an average of 10h and 0min of daylight.