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
In Foresthill, December is the coldest month, with temperatures averaging a high of 49.1°F (9.5°C) and a low of 34.2°F (1.2°C).Humidity
In December, the average relative humidity is 69%.Rainfall
In Foresthill, during December, the rain falls for 11 days and regularly aggregates up to 5.59" (142mm) of precipitation. In Foresthill, during the entire year, the rain falls for 85.5 days and collects up to 35.94" (913mm) of precipitation.Snowfall
Months with snowfall are January through May, November and December. In Foresthill, in December, during 3.9 snowfall days, 4.96" (126mm) of snow is typically accumulated. In Foresthill, during the entire year, snow falls for 22.8 days and aggregates up to 56.06" (1424mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:03 am and sunset at 4:41 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:51 pm PST.
Sunshine
In December, the average sunshine in Foresthill is 5.8h.UV index
February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: An average maximum UV index of 2 in December leads to these recommendations:
Despite the majority tolerating prolonged sun exposure, those with sensitive skin, infants, and children demand continual protection. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest?
What is the temperature in December?
What is the average humidity in December?
How many days does it rain in December?
How many days does it snow in December?
What is the month with the shortest days in Foresthill?
How many hours of daylight does Foresthill have in December?
When is the sunrise / sunset in December?
How long on average sun shines in December?
What is the month with the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
Foresthill, CA
- Average high temperature in December: 49.1°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is December (49.1°F).
- Average low temperature in December: 34.2°F
The month with the highest average low temperature is July (57.2°F).
The coldest month (with the lowest average low temperature) is December (34.2°F).
Average pressure in December
Foresthill, 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
Foresthill, 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
Foresthill, CA
- Average humidity in December: 69%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is July (38%).
Average rainfall in December
Foresthill, CA
- Average rainfall in December: 5.59"
The wettest month (with the highest rainfall) is March (7.01").
The driest month (with the least rainfall) is July (0.04").
Average rainfall days in December
Foresthill, CA
- Average rainfall days in December: 11 days
The month with the highest number of rainy days is March (13.9 days).
The month with the least rainy days is July (1.4 days).
Average snowfall in December
Foresthill, CA
- Average snowfall in December: 4.96"
The month with the highest snowfall is March (17.87").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in December
Foresthill, CA
- Average snowfall days in December: 3.9 days
The month with the highest number of snowfall days is March (5.4 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
Foresthill, CA
- Average daylight in December: 9h and 3min
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 5min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in December
Foresthill, CA
- Average sunshine days in December: 18.5 days
The month with the most sunshine days is July (28.4 days).
The month with the least sunshine days is March (13.5 days).
Average UV index in December
Foresthill, CA
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover in December
Foresthill, CA
- Average cloud cover in December: 35
The month with the most cloud cover is March (Cloud cover 43).
The months with the least cloud cover are July and August (Cloud cover 5).
Average visibility in December
Foresthill, 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).
Foresthill, California, USA
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