December weather forecast
San Rafael, CA

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Weather in December

December, the first month of the winter in San Rafael, is also a moderate month, with an average temperature ranging between min 45.3°F (7.4°C) and max 55.4°F (13°C).

Temperature

San Rafael witnesses the coldest weather in December, with temperatures averaging a high of 55.4°F (13°C) and a low of 45.3°F (7.4°C).

Humidity

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

Rainfall

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

Daylight

The month with the shortest days is December, with an average of 9h and 36min of daylight.
On the first day of December in San Rafael, sunrise is at 7:07 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 5:01 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 5.5h of sunshine.

UV index

The months with the lowest UV index in San Rafael, California, are January, February, November and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: During December, 3 as the daily maximum UV index converts into the following advice:
Be careful. Light complexion individuals might get burns in fewer than 30 minutes. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
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Frequently asked questions

What are the coldest months in San Rafael?

The lowest temperatures in San Rafael, California, are recorded in December, with averages reaching a high of 55.4°F (13°C) and a low of 45.3°F (7.4°C).

What are December temperatures in San Rafael?

An average high-temperature, in December, in San Rafael, 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 Rafael?

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

How many days does it rain in December in San Rafael?

In December, in San Rafael, California, the rain falls for 7.2 days. Throughout December, 0.67" (17mm) of precipitation is accumulated.

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

December has the shortest days of the year in San Rafael, California, with an average of 9h and 36min of daylight.

How many hours of daylight does San Rafael have in December?

In December, the average day length in San Rafael, California, is 9h and 35min.

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

On the first day of December in San Rafael, California, sunrise is at 7:07 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 5:01 pm PST.

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

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

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

The average sunshine duration in December is 5.5h.

What is the month with the lowest UV index in San Rafael?

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

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

In San Rafael, California, the average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a medium hazard to health from unsafe exposure to Sun's UV rays.
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 Rafael, CA

Average temperature in December - San Rafael, 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 Rafael, CA

Average pressure in December - San Rafael, 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 Rafael, CA

Average wind speed in December - San Rafael, 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 Rafael, CA

Average humidity in December - San Rafael, 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 Rafael, CA

Average rainfall in December - San Rafael, 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 Rafael, CA

Average rainfall days in December - San Rafael, 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 Rafael, CA

Average daylight in December / Average sunshine in December - San Rafael, 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).

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Average sunshine days in December
San Rafael, CA

Average sunshine days in December - San Rafael, 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 Rafael, CA

Average UV index in December - San Rafael, 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 Rafael, CA

Average cloud cover in December - San Rafael, 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 Rafael, CA

Average visibility in December - San Rafael, 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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San Rafael, California, USA

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