December weather forecastFairfield, CA
December
Weather in December
December, the first month of the winter in Fairfield, is still a cool month, with an average temperature ranging between min 41.7°F (5.4°C) and max 54.9°F (12.7°C).Temperature
December is the month when Fairfield experiences its coldest temperatures, averaging a high of 54.9°F (12.7°C) and a low of 41.7°F (5.4°C).Humidity
The average relative humidity in December is 71%.Rainfall
In December, the rain falls for 10.2 days. Throughout December, 1.97" (50mm) of precipitation is accumulated. Throughout the year, there are 71.4 rainfall days, and 12.13" (308mm) of precipitation is accumulated.Daylight
With an average of 9h and 36min of daylight, December has the shortest days of the year.On the first day of December, sunrise is at 7:06 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:58 pm PST.
Sunshine
December has the least sunshine of the year, 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 threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: The UV index of 3 in December translates into these instructions:
Guard yourself - Avoiding sunburn is suggested. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Fairfield, CA
- Average high temperature in December: 54.9°F
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is December (54.9°F).
- Average low temperature in December: 41.7°F
The month with the highest average low temperature is September (57.6°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).
Average pressure in December
Fairfield, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June and August (29.91"Hg).
Average wind speed in December
Fairfield, CA
- Average wind speed in December: 4.8mph
The windiest months (with the highest average wind speed) are May, June and July (7mph).
The calmest months (with the lowest average wind speed) are January and November (4.5mph).
Average humidity in December
Fairfield, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (75%).
The month with the lowest relative humidity is September (52%).
Average rainfall in December
Fairfield, CA
- Average rainfall in December: 1.97"
The wettest month (with the highest rainfall) is February (2.4").
The driest month (with the least rainfall) is August (0").
Average rainfall days in December
Fairfield, CA
- Average rainfall days in December: 10.2 days
The month with the highest number of rainy days is March (12.9 days).
The month with the least rainy days is August (0.7 days).
Average daylight in December /
Average sunshine in December
Fairfield, 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: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).
Average sunshine days in December
Fairfield, CA
- Average sunshine days in December: 19.9 days
The month with the most sunshine days is August (30.2 days).
The month with the least sunshine days is March (17 days).
Average UV index in December
Fairfield, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
Fairfield, CA
- Average cloud cover in December: 37
The months with the most cloud cover are March and December (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 5).
Average visibility in December
Fairfield, 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).
