December weather forecastSanta Monica, CA
December
Weather in December
December, the first month of the winter in Santa Monica, is still a comfortable month, with an average temperature ranging between max 63.9°F (17.7°C) and min 50.7°F (10.4°C).Temperature
December, known for its average high temperature of 63.9°F (17.7°C) and an average low temperature of 50.7°F (10.4°C), is the coldest month.Humidity
The average relative humidity in December in Santa Monica is 55%.Rainfall
In Santa Monica, during December, the rain falls for 5.2 days and regularly aggregates up to 1.26" (32mm) of precipitation. In Santa Monica, during the entire year, the rain falls for 48.8 days and collects up to 7.52" (191mm) of precipitation.Ocean temperature
The months with the coldest seawater are January through May and December, with an average ocean temperature of 59°F (15°C).Note: For most individuals, swimming in 59°F (15°C) is not enjoyable. As the water temperature decreases from 69.8°F (21°C) to 59°F (15°C), breathing control becomes increasingly difficult.
Daylight
December has the shortest days of the year, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 6:41 am and sunset at 4:44 pm. On the last day of December, sunrise is at 6:59 am and sunset at 4:55 pm PST.
Sunshine
February and December, with an average of 6.6h of sunshine, are months with the least sunshine.UV index
January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 4 during December leads to these advisories:
Undertake protective steps - Recommendations to avoid sunburn are issued. The Sun's radiation is especially intense around midday; try to stay in shade during this period. 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
Santa Monica, CA
- Average high temperature in December: 63.9°F
The warmest month (with the highest average high temperature) is August (80.8°F).
The month with the lowest average high temperature is December (63.9°F).
- Average low temperature in December: 50.7°F
The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is February (50.5°F).
Average pressure in December
Santa Monica, CA
- Average pressure in December: 30.08"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are June and September (29.9"Hg).
Average wind speed in December
Santa Monica, CA
- Average wind speed in December: 5.8mph
The windiest month (with the highest average wind speed) is April (6.3mph).
The calmest months (with the lowest average wind speed) are August and September (4.8mph).
Average humidity in December
Santa Monica, CA
- Average humidity in December: 55%
The month with the highest relative humidity is June (69%).
The month with the lowest relative humidity is November (52%).
Average rainfall in December
Santa Monica, CA
- Average rainfall in December: 1.26"
The wettest month (with the highest rainfall) is January (1.54").
The driest months (with the least rainfall) are June and August (0.08").
Average rainfall days in December
Santa Monica, CA
- Average rainfall days in December: 5.2 days
The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is August (1.8 days).
Average sea temperature in December
Santa Monica, CA
- Average sea temperature in December: 59°F
The best months for swimming (with the highest average sea temperature) are August, September and October (66°F).
The coldest months (with the lowest average sea temperature) are January, February, March, April, May and December (59°F).
Average daylight in December /
Average sunshine in December
Santa Monica, CA
- Average daylight in December: 9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 6h and 36min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The months with the least sunshine are February and December (Average sunshine: 6h and 36min).
Average sunshine days in December
Santa Monica, CA
- Average sunshine days in December: 24.1 days
The month with the most sunshine days is August (27.9 days).
The month with the least sunshine days is February (21.8 days).
Average UV index in December
Santa Monica, CA
- Average UV index in December: 4
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
Average cloud cover in December
Santa Monica, CA
- Average cloud cover in December: 23
The months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 8).
Average visibility in December
Santa Monica, 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).
