December weather forecastPenngrove, CA
December
Weather in December
December, the first month of the winter in Penngrove, is also a moderate month, with an average temperature ranging between max 55.6°F (13.1°C) and min 42.4°F (5.8°C).Temperature
The coldest period tends to be December, when average temperatures fluctuate between a high of 55.6°F (13.1°C) and a low of 42.4°F (5.8°C).Humidity
In Penngrove, California, the average relative humidity in December is 74%.Rainfall
In December, in Penngrove, California, the rain falls for 6.4 days. Throughout December, 0.67" (17mm) of precipitation is accumulated. In Penngrove, during the entire year, the rain falls for 44.3 days and collects up to 3.78" (96mm) of precipitation.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:09 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:27 am and sunset at 5:00 pm PST.
Sunshine
The month with the least sunshine in Penngrove is December, with an average of 5.7h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the ordinary person.Note: In December, the UV index of 3 transforms into the following advice:
Take necessary precautions - Protection from skin and eye injury is mandatory. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Employ a wide-brim hat for potent defense against up to 50% of UV rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Penngrove, CA
- Average high temperature in December: 55.6°F
The warmest months (with the highest average high temperature) are July and August (79.9°F).
The month with the lowest average high temperature is December (55.6°F).
- Average low temperature in December: 42.4°F
The months with the highest average low temperature are August and September (55°F).
The coldest month (with the lowest average low temperature) is December (42.4°F).
Average pressure in December
Penngrove, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in December
Penngrove, CA
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is May (6.8mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).
Average humidity in December
Penngrove, CA
- Average humidity in December: 74%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).
Average rainfall in December
Penngrove, CA
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is February (0.91").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in December
Penngrove, CA
- Average rainfall days in December: 6.4 days
The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (0.5 days).
Average daylight in December /
Average sunshine in December
Penngrove, CA
- Average daylight in December: 9h and 36min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in December
Penngrove, CA
- Average sunshine days in December: 22.5 days
The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is March (20.8 days).
Average UV index in December
Penngrove, CA
- Average UV index in December: 3
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Penngrove, CA
- Average cloud cover in December: 37
The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in December
Penngrove, 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).
