December weather forecastPenn Valley, CA
December
Weather in December
The first month of the winter, December, is also a fresh month in Penn Valley, California, with an average temperature varying between 51.3°F (10.7°C) and 37.2°F (2.9°C).Temperature
In Penn Valley, the lowest temperatures are generally noted in December, averaging a high of 51.3°F (10.7°C) and a low of 37.2°F (2.9°C).Humidity
In December, the average relative humidity is 68%.Rainfall
In Penn Valley, in December, during 10.7 rainfall days, 5.35" (136mm) of precipitation is typically accumulated. In Penn Valley, during the entire year, the rain falls for 82 days and collects up to 33.11" (841mm) of precipitation.Snowfall
January through May, November and December are months with snowfall. In Penn Valley, California, during December, snow falls for 0.5 days and regularly aggregates up to 0.71" (18mm) of snow. Throughout the year, in Penn Valley, there are 6.8 snowfall days, and 14.41" (366mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 30min of daylight.On the first day of December in Penn Valley, sunrise is at 7:05 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:52 pm PST.
Sunshine
In Penn Valley, the average sunshine in December is 5.8h.UV index
In December, the average daily maximum UV index is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 3 during December leads to these advisories:
Ensure safety - Recommendations to avert sunburn are presented. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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
Penn Valley, 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).
