Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
December
Weather in December
Temperature
December stands out as San Anselmo's coldest month, with an average high-temperature of 55.4°F (13°C) and a low-temperature of 45.3°F (7.4°C).Humidity
In December, the average relative humidity is 73%.Rainfall
In December, the rain falls for 7.2 days. Throughout December, 0.67" (17mm) of precipitation is accumulated. In San Anselmo, during the entire year, the rain falls for 48 days and collects up to 3.94" (100mm) 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 December, sunrise is at 7:08 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 5:01 pm PST.
Sunshine
With an average of 5.5h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index in San Anselmo are January, February, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily maximum UV index of 3 in December interprets into the following advice:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest month?
What is the temperature in December?
What is the average humidity in December in San Anselmo?
How many days does it rain in December?
What is the month with the shortest days in San Anselmo?
What is the average length of the day in December?
When are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does San Anselmo have in December?
What are the months with the lowest UV index?
How high is the UV index in December in San Anselmo?
Average temperature in December
San Anselmo, CA
- Average high temperature in December: 55.4°F
The warmest month (with the highest average high temperature) is September (72.3°F).
The month with the lowest average high temperature is December (55.4°F).
- Average low temperature in December: 45.3°F
The month with the highest average low temperature is September (56.1°F).
The coldest month (with the lowest average low temperature) is December (45.3°F).
Average pressure in December
San Anselmo, CA
- Average pressure in December: 30.1"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
San Anselmo, CA
- Average wind speed in December: 6.2mph
The windiest month (with the highest average wind speed) is May (7.8mph).
The calmest months (with the lowest average wind speed) are October and November (5.5mph).
Average humidity in December
San Anselmo, CA
- Average humidity in December: 73%
The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is October (68%).
Average rainfall in December
San Anselmo, CA
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is February (0.87").
The driest months (with the least rainfall) are June, July, August and September (0.04").
Average rainfall days in December
San Anselmo, CA
- Average rainfall days in December: 7.2 days
The month with the highest number of rainy days is March (8.8 days).
The months with the least rainy days are June and August (1.2 days).
Average daylight in December /
Average sunshine in December
San Anselmo, CA
- Average daylight in December: 9h and 4min
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 3min
The month with the most sunshine is July (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 5h and 30min).
Average sunshine days in December
San Anselmo, CA
- Average sunshine days in December: 22.1 days
The month with the most sunshine days is June (26.4 days).
The month with the least sunshine days is March (20.7 days).
Average UV index in December
San Anselmo, CA
- Average UV index in December: 3
The months with the highest UV index are April, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
San Anselmo, CA
- Average cloud cover in December: 38
The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is September (Cloud cover 19).
Average visibility in December
San Anselmo, 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).