December weather forecastPosts, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in Posts, California, with an average temperature fluctuating between 46.9°F (8.3°C) and 57°F (13.9°C).Temperature
Posts's coldest month, December, generally records average temperatures ranging from a high of 57°F (13.9°C) to a low of 46.9°F (8.3°C).Humidity
In Posts, the average relative humidity in December is 72%.Rainfall
The month with the most rainfall is December, when the rain falls for 9.8 days and typically aggregates up to 2.48" (63mm) of precipitation.Daylight
December has the shortest days of the year in Posts, with an average of 9h and 42min of daylight.On the first day of December, sunrise is at 7:00 am and sunset at 4:52 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 5:02 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 5.9h of sunshine.UV index
With an average maximum UV index of 3, December is the month with the lowest UV index in Posts. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: A typical high UV index of 3 in December suggests the following recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. To guard against the harmful effects of the Sun, minimize exposure during midday. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Posts, CA
- Average high temperature in December: 57°F
The warmest month (with the highest average high temperature) is September (69.6°F).
The month with the lowest average high temperature is December (57°F).
- Average low temperature in December: 46.9°F
The month with the highest average low temperature is September (55.4°F).
The coldest month (with the lowest average low temperature) is December (46.9°F).
Average pressure in December
Posts, 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 (29.93"Hg).
Average wind speed in December
Posts, CA
- Average wind speed in December: 7.3mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in December
Posts, CA
- Average humidity in December: 72%
The month with the highest relative humidity is August (79%).
The month with the lowest relative humidity is November (70%).
Average rainfall in December
Posts, CA
- Average rainfall in December: 2.48"
The wettest month (with the highest rainfall) is December (2.48").
The driest month (with the least rainfall) is August (0.04").
Average rainfall days in December
Posts, CA
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (1.3 days).
Average daylight in December /
Average sunshine in December
Posts, CA
- Average daylight in December: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 5h and 54min
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 54min).
Average sunshine days in December
Posts, CA
- Average sunshine days in December: 20.3 days
The month with the most sunshine days is August (27.8 days).
The month with the least sunshine days is March (17.3 days).
Average UV index in December
Posts, CA
- Average UV index in December: 3
The months with the highest UV index are June, July, August and September (UV index 5).
The month with the lowest UV index is December (UV index 3).
Average cloud cover in December
Posts, CA
- Average cloud cover in December: 33
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in December
Posts, 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).
