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 coldest month is December, with an average high-temperature of 25°F (-3.9°C) and an average low-temperature of 8.6°F (-13°C).Humidity
In December, the average relative humidity in Sun Valley is 84%.Rainfall
In Sun Valley, Idaho, during December, the rain falls for 7 days and regularly aggregates up to 1.65" (42mm) of precipitation. In Sun Valley, Idaho, during the entire year, the rain falls for 107.7 days and collects up to 15.63" (397mm) of precipitation.Snowfall
Months with snowfall in Sun Valley are January through June, September through December. In Sun Valley, in December, snow falls for 14 days, with typically accumulated 12.05" (306mm) of snow. Throughout the year, in Sun Valley, there are 88.2 snowfall days, and 69.45" (1764mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 0min of daylight.On the first day of December in Sun Valley, sunrise is at 7:51 am and sunset at 5:01 pm. On the last day of the month, sunrise is at 8:10 am and sunset at 5:10 pm MST.
Sunshine
The average sunshine in December in Sun Valley, Idaho, is 5.8h.UV index
In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: A typical high UV index of 2 in December suggests the following recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest in Sun Valley?
How cold is December in Sun Valley?
What is the average humidity in December in Sun Valley?
How much does it rain in Sun Valley in December?
How much does it snow in Sun Valley in December?
What is the month with the shortest days in Sun Valley?
What is the average length of the day in December in Sun Valley?
When is the sunrise / sunset in December in Sun Valley?
How many hours of sunshine does Sun Valley have in December?
How high is the UV index in December in Sun Valley?
Average temperature in December
Sun Valley, ID
- Average high temperature in December: 25°F
The warmest month (with the highest average high temperature) is July (74.1°F).
The month with the lowest average high temperature is December (25°F).
- Average low temperature in December: 8.6°F
The months with the highest average low temperature are July and August (50.5°F).
The coldest month (with the lowest average low temperature) is January (8.4°F).
Average pressure in December
Sun Valley, ID
- Average pressure in December: 30.24"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Sun Valley, ID
- Average wind speed in December: 4.7mph
The windiest month (with the highest average wind speed) is July (6.3mph).
The calmest month (with the lowest average wind speed) is January (4.5mph).
Average humidity in December
Sun Valley, ID
- Average humidity in December: 84%
The month with the highest relative humidity is February (87%).
The month with the lowest relative humidity is August (37%).
Average rainfall in December
Sun Valley, ID
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is March (2.01").
The driest month (with the least rainfall) is July (0.43").
Average rainfall days in December
Sun Valley, ID
- Average rainfall days in December: 7 days
The month with the highest number of rainy days is May (14.8 days).
The month with the least rainy days is July (5.9 days).
Average snowfall in December
Sun Valley, ID
- Average snowfall in December: 12.05"
The month with the highest snowfall is February (15").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Sun Valley, ID
- Average snowfall days in December: 14 days
The month with the highest number of snowfall days is March (16 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Sun Valley, ID
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 5h and 5min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in December
Sun Valley, ID
- Average sunshine days in December: 15.8 days
The month with the most sunshine days is July (20.8 days).
The month with the least sunshine days is April (11.1 days).
Average UV index in December
Sun Valley, ID
- Average UV index in December: 2
The months with the highest UV index are June and July (UV index 5).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Sun Valley, ID
- Average cloud cover in December: 40
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in December
Sun Valley, ID
- Average visibility in December: 4mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (4mi).
Sun Valley, Idaho, USA
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