December weather forecastAlta Sierra, CA
December
Weather in December
December, the first month of the winter in Alta Sierra, is also a fresh month, with an average temperature ranging between max 51.3°F (10.7°C) and min 37.2°F (2.9°C).Temperature
With an average high-temperature of 51.3°F (10.7°C) and an average low-temperature of 37.2°F (2.9°C), December is the coldest month.Humidity
In December, the average relative humidity in Alta Sierra is 68%.Rainfall
In Alta Sierra, in December, it is raining for 10.7 days, with typically 5.35" (136mm) of accumulated precipitation. Throughout the year, there are 82 rainfall days, and 33.11" (841mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, November and December. In Alta Sierra, in December, during 0.5 snowfall days, 0.71" (18mm) of snow is typically accumulated. Throughout the year, there are 6.8 snowfall days, and 14.41" (366mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 7:05 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:51 pm PST.
Sunshine
The average sunshine in December is 5.8h.UV index
The average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: In December, a daily UV index of 3 turns into the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. To cut down UV radiation exposure by about half, sport a wide-brim hat. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Alta Sierra, CA
- Average high temperature in December: 51.3°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (51.3°F).
- Average low temperature in December: 37.2°F
The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).
Average pressure in December
Alta Sierra, CA
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in December
Alta Sierra, CA
- Average wind speed in December: 5.3mph
The windiest month (with the highest average wind speed) is February (6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Alta Sierra, CA
- Average humidity in December: 68%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is July (37%).
Average rainfall in December
Alta Sierra, CA
- Average rainfall in December: 5.35"
The wettest month (with the highest rainfall) is March (6.57").
The driest months (with the least rainfall) are July and August (0.04").
Average rainfall days in December
Alta Sierra, CA
- Average rainfall days in December: 10.7 days
The month with the highest number of rainy days is March (15.1 days).
The month with the least rainy days is July (1.1 days).
Average snowfall in December
Alta Sierra, CA
- Average snowfall in December: 0.71"
The month with the highest snowfall is February (6.42").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Alta Sierra, CA
- Average snowfall days in December: 0.5 days
The month with the highest number of snowfall days is March (2.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Alta Sierra, CA
- Average daylight in December: 9h and 30min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 5h and 48min
The month with the most sunshine is July (Average sunshine: 12h and 12min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in December
Alta Sierra, CA
- Average sunshine days in December: 19.1 days
The month with the most sunshine days is July (29.8 days).
The month with the least sunshine days is March (14.8 days).
Average UV index in December
Alta Sierra, CA
- Average UV index in December: 3
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is November (UV index 2).
Average cloud cover in December
Alta Sierra, CA
- Average cloud cover in December: 35
The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 4).
Average visibility in December
Alta Sierra, CA
- 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).
