December weather forecastPhoenix, AZ
December
Weather in December
December in Phoenix rounds off the year under the gentle glow of winter sun. As the city greets the last month of the year, a soothing chill fills the air. Average high temperatures drop even further to a bearable 63°F (17.2°C), confirming the onset of winter. The city transforms into a winter wonderland with holiday decorations embellishing every corner. Despite the abundant sunshine and blue skies, the chilly touch of winter is unmistakeable this month.Temperature
The month of December sees the lowest average temperatures, reaching 63°F (17.2°C) at the peak and 47.8°F (8.8°C) at the low.Humidity
With an average relative humidity of 43%, December is the most humid month in Phoenix.Rainfall
In Phoenix, in December, it is raining for 5 days, with typically 0.59" (15mm) of accumulated precipitation. Throughout the year, there are 44.6 rainfall days, and 5.04" (128mm) of precipitation is accumulated.Snowfall
January through August, October through December are months without snowfall.Daylight
With an average of 10h and 0min of daylight, December has the shortest days of the year.On the first day of December in Phoenix, sunrise is at 7:14 am and sunset at 5:20 pm. On the last day of the month, sunrise is at 7:32 am and sunset at 5:31 pm MST.
Sunshine
With an average of 6.8h of sunshine, December has the least sunshine of the year.UV index
December is the month with the lowest UV index in Phoenix, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The daily high UV index of 3 in December translates into this advice:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Phoenix, AZ
- Average high temperature in December: 63°F
The warmest month (with the highest average high temperature) is July (103.6°F).
The month with the lowest average high temperature is December (63°F).
- Average low temperature in December: 47.8°F
The month with the highest average low temperature is August (84.7°F).
The coldest month (with the lowest average low temperature) is January (47.5°F).
Average pressure in December
Phoenix, AZ
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.81"Hg).
Average wind speed in December
Phoenix, AZ
- Average wind speed in December: 4.3mph
The windiest month (with the highest average wind speed) is April (6.4mph).
The calmest month (with the lowest average wind speed) is December (4.3mph).
Average humidity in December
Phoenix, AZ
- Average humidity in December: 43%
The month with the highest relative humidity is December (43%).
The month with the lowest relative humidity is June (16%).
Average rainfall in December
Phoenix, AZ
- Average rainfall in December: 0.59"
The wettest month (with the highest rainfall) is July (0.75").
The driest months (with the least rainfall) are May and June (0.08").
Average rainfall days in December
Phoenix, AZ
- Average rainfall days in December: 5 days
The month with the highest number of rainy days is July (7.8 days).
The month with the least rainy days is June (0.8 days).
Average snowfall in December
Phoenix, AZ
- Average snowfall in December: 0"
The month with the highest snowfall is September (0.04").
The months with the least snowfall are January, February, March, April, May, June, July, August, October, November and December (0").
Average snowfall days in December
Phoenix, AZ
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is September (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).
Average daylight in December /
Average sunshine in December
Phoenix, AZ
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 6h and 48min
The month with the most sunshine is June (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in December
Phoenix, AZ
- Average sunshine days in December: 25.5 days
The month with the most sunshine days is May (29.2 days).
The month with the least sunshine days is July (21.1 days).
Average UV index in December
Phoenix, AZ
- Average UV index in December: 3
The months with the highest UV index are May, June, July and August (UV index 8).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Phoenix, AZ
- Average cloud cover in December: 21
The month with the most cloud cover is December (Cloud cover 21).
The month with the least cloud cover is June (Cloud cover 5).
Average visibility in December
Phoenix, AZ
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
