Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The arrival of December signals a shift in temperature, down from a moderate 59.2°F (15.1°C) in November to a chilly 47.7°F (8.7°C). Sun Valley, during the nights of December, experiences an average temperature drop to a freezing cold 30.9°F (-0.6°C).Humidity
In December, the average relative humidity is 54%.Rainfall
In Sun Valley, during December, the rain falls for 5.1 days and regularly aggregates up to 0.63" (16mm) of precipitation. Throughout the year, there are 74.3 rainfall days, and 7.2" (183mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Sun Valley, in December, during 3.1 snowfall days, 1.3" (33mm) of snow is typically accumulated. In Sun Valley, during the entire year, snow falls for 11.2 days and aggregates up to 5.98" (152mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 54min of daylight.On the first day of December, sunrise is at 7:10 am and sunset at 5:08 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 5:19 pm MST.
Sunshine
The month with the least sunshine is December, with an average of 6.8h of sunshine.UV index
The month with the lowest UV index in Sun Valley is December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: A typical high UV index of 2 in December suggests the following recommendations:
While most people are not greatly affected by extended sun exposure, those with fair skin, babies, and children must always have protection. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days in Sun Valley?
What is the average length of the day in December?
What time are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Sun Valley have in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Sun Valley, AZ
- Average high temperature in December: 47.7°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (46.8°F).
- Average low temperature in December: 30.9°F
The month with the highest average low temperature is July (70.5°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).
Average pressure in December
Sun Valley, AZ
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The months with the lowest atmospheric pressure are May and June (29.88"Hg).
Average wind speed in December
Sun Valley, AZ
- Average wind speed in December: 6.9mph
The windiest months (with the highest average wind speed) are April and May (10.6mph).
The calmest month (with the lowest average wind speed) is January (6.1mph).
Average humidity in December
Sun Valley, AZ
- Average humidity in December: 54%
The month with the highest relative humidity is January (59%).
The month with the lowest relative humidity is June (18%).
Average rainfall in December
Sun Valley, AZ
- Average rainfall in December: 0.63"
The wettest month (with the highest rainfall) is July (1.1").
The driest month (with the least rainfall) is June (0.16").
Average rainfall days in December
Sun Valley, AZ
- Average rainfall days in December: 5.1 days
The month with the highest number of rainy days is July (13.3 days).
The months with the least rainy days are June and November (3.4 days).
Average snowfall in December
Sun Valley, AZ
- Average snowfall in December: 1.3"
The month with the highest snowfall is February (2.17").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Sun Valley, AZ
- Average snowfall days in December: 3.1 days
The month with the highest number of snowfall days is December (3.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Sun Valley, AZ
- Average daylight in December: 9h and 5min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 6h and 5min
The month with the most sunshine is August (Average sunshine: 12h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 48min).
Average sunshine days in December
Sun Valley, AZ
- Average sunshine days in December: 23.7 days
The months with the most sunshine days are May, June and November (25.3 days).
The month with the least sunshine days is July (12.8 days).
Average UV index in December
Sun Valley, AZ
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 7).
The month with the lowest UV index is December (UV index 2).
Average cloud cover in December
Sun Valley, AZ
- Average cloud cover in December: 23
The month with the most cloud cover is December (Cloud cover 23).
The month with the least cloud cover is June (Cloud cover 9).
Average visibility in December
Sun Valley, 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).
Sun Valley, Arizona, USA
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