December weather forecast
San Anselmo, CA

Weather in December

The first month of the winter, December, is still a mild month in San Anselmo, California, with temperature in the range of an average high of 55.4°F (13°C) and an average low of 45.3°F (7.4°C).

Temperature

With an average high-temperature of 55.4°F (13°C) and an average low-temperature of 45.3°F (7.4°C), December is the coldest month.

Humidity

In December, the average relative humidity in San Anselmo is 73%.

Rainfall

In December, in San Anselmo, the rain falls for 7.2 days. Throughout December, 0.67" (17mm) of precipitation is accumulated. In San Anselmo, California, during the entire year, the rain falls for 48 days and collects up to 3.94" (100mm) of precipitation.

Daylight

December has the shortest days of the year in San Anselmo, with an average of 9h and 35min of daylight.
On the first day of December, sunrise is at 7:07 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 5:00 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 reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 3 in December transform into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in San Anselmo?

December is the coldest month in San Anselmo, with an average high-temperature of 55.4°F (13°C) and an average low-temperature of 45.3°F (7.4°C).

What is the temperature in December in San Anselmo?

In San Anselmo, California, in December, the average high-temperature is 55.4°F (13°C), and the average low-temperature is 45.3°F (7.4°C).

What is the average humidity in December in San Anselmo?

The average relative humidity in December is 73%.

How much does it rain in San Anselmo in December?

In San Anselmo, during December, the rain falls for 7.2 days and regularly aggregates up to 0.67" (17mm) of precipitation.

What is the month with the shortest days in San Anselmo?

The month with the shortest days in San Anselmo is December, with an average of 9h and 35min of daylight.

What is the average length of the day in December in San Anselmo?

The average day length in December in San Anselmo, California, is 9h and 35min.

When is the sunrise / sunset in December in San Anselmo?

In December, on the first day of the month, sunrise is at 7:07 am and sunset at 4:51 pm. On the last day of the month, in San Anselmo, California, sunrise is at 7:25 am and sunset at 5:00 pm PST.

What is the month with the least sunshine in San Anselmo?

The month with the least sunshine is December, with an average of 5.5h of sunshine.

How many hours of sunshine does San Anselmo have in December?

In San Anselmo, the average sunshine duration in December is 5.5h.

When is the lowest UV index in San Anselmo?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3.

What is the UV index reading in December in San Anselmo?

In December, the average daily maximum UV index in San Anselmo is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
San Anselmo, CA

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).

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Average pressure in December
San Anselmo, CA

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).

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Average wind speed in December
San Anselmo, CA

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).

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Average humidity in December
San Anselmo, CA

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%).

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Average rainfall in December
San Anselmo, CA

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").

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Average rainfall days in December
San Anselmo, CA

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).

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Average daylight in December /
Average sunshine in December
San Anselmo, CA

Average daylight in December / Average sunshine in December - San Anselmo, CA
  • Average daylight in December: 9h and 35min

The month with the longest days is June (Average daylight: 14h and 46min).
The month with the shortest days is December (Average daylight: 9h and 35min).

  • Average sunshine in December: 5h and 30min

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).

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Average sunshine days in December
San Anselmo, CA

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).

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Average UV index in December
San Anselmo, CA

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).

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Average cloud cover in December
San Anselmo, CA

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).

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Average visibility in December
San Anselmo, CA

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).

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