December weather forecast and climate
Bolinas, CA

Weather in December

The first month of the winter, December, is also a fresh month in Bolinas, California, with average temperature varying between 46°F (7.8°C) and 55.2°F (12.9°C).

Temperature

The coldest month is December, with an average high-temperature of 55.2°F (12.9°C) and an average low-temperature of 46°F (7.8°C).

Humidity

In Bolinas, California, the average relative humidity is 73%.

Rainfall

In Bolinas, in December, during 10.9 rainfall days, 2.83" (72mm) of precipitation is typically accumulated. In Bolinas, during the entire year, the rain falls for 80.3 days and collects up to 15.98" (406mm) of precipitation.

Snowfall

The only month with snowfall is December. December has the most snowfall days of the year in Bolinas. Snow falls for 0.1 days.

Ocean temperature

In December, the average ocean temperature is 54.3°F (12.4°C).
Note: Swimming in 54.3°F (12.4°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

December has the shortest days of the year, with an average of 9.6h of daylight.

Sunshine

December has the least sunshine of the year, with an average of 5.6h of sunshine.

UV index

Months with the lowest UV index in Bolinas are February, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Bolinas?

The coldest month in Bolinas, California, is December, with an average high-temperature of 55.2°F (12.9°C) and an average low-temperature of 46°F (7.8°C).

What is the temperature in December in Bolinas?

In Bolinas, California, in December, the average high-temperature is 55.2°F (12.9°C), and the average low-temperature is 46°F (7.8°C).

What is the average humidity in December in Bolinas?

The average relative humidity in December is 73%.

How much does it rain in Bolinas in December?

In Bolinas, California, in December, it is raining for 10.9 days, with typically 2.83" (72mm) of accumulated precipitation.

When does it start to snow in Bolinas?

December is the first month it typically snows in Bolinas. Throughout December, there are 0.1 snowfall days.

When does it snow the most in Bolinas?

December has the most snowfall days of the year in Bolinas, California. Snow falls for 0.1 days.

How cold is the water in December in Bolinas?

In Bolinas, California, the average seawater temperature in December is 54.3°F (12.4°C). Swimming in 54.3°F (12.4°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

What is the month with the shortest days in Bolinas?

With an average of 9.6h of daylight, December has the shortest days of the year.

How many hours of daylight does Bolinas have in December?

The average length of the day in December is 9.6h.

What is the month with the least sunshine in Bolinas?

December has the least sunshine of the year in Bolinas, with an average of 5.6h of sunshine.

How long on average sun shines in December in Bolinas?

In December, the average sunshine in Bolinas is 5.6h.

When is the lowest UV index in Bolinas?

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

What is the UV index intensity in December in Bolinas?

In December, the average daily maximum UV index in Bolinas, California, is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV rays.

Average temperature in December
Bolinas, CA

Average temperature in December - Bolinas, CA
  • Average high temperature in December: 55.2°F

The warmest month (with the highest average high temperature) is September (70.9°F).
The month with the lowest average high temperature is December (55.2°F).

  • Average low temperature in December: 46°F

The month with the highest average low temperature is September (56.3°F).
The coldest month (with the lowest average low temperature) is December (46°F).

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Average pressure in December
Bolinas, CA

Average pressure in December - Bolinas, CA
  • Average pressure in December: 30.1"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed in December
Bolinas, CA

Average wind speed in December - Bolinas, CA
  • Average wind speed in December: 6.7mph

The windiest months (with the highest average wind speed) are April and May (8.3mph).
The calmest month (with the lowest average wind speed) is November (5.9mph).

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Average humidity in December
Bolinas, CA

Average humidity in December - Bolinas, CA
  • Average humidity in December: 73%

The month with the highest relative humidity is August (78%).
The month with the lowest relative humidity is October (69%).

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Average rainfall in December
Bolinas, CA

Average rainfall in December - Bolinas, CA
  • Average rainfall in December: 2.83"

The wettest month (with the highest rainfall) is February (3.43").
The driest months (with the least rainfall) are July and August (0.08").

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Average rainfall days in December
Bolinas, CA

Average rainfall days in December - Bolinas, CA
  • Average rainfall days in December: 10.9 days

The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is July (2.3 days).

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Average snowfall days in December
Bolinas, CA

Average snowfall days in December - Bolinas, CA
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is December (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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Average sea temperature in December
Bolinas, CA

Average sea temperature in December - Bolinas, CA
  • Average sea temperature in December: 54.3°F

The best month for swimming (with the highest average sea temperature) is September (56.9°F).
The coldest month (with the lowest average sea temperature) is June (52.4°F).

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Average daylight in December /
Average sunshine in December
Bolinas, CA

Average daylight in December / Average sunshine in December - Bolinas, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 5.6h

The month with the most sunshine is July (Average sunshine: 11.2h).
The month with the least sunshine is December (Average sunshine: 5.6h).

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Average sunshine days in December
Bolinas, CA

Average sunshine days in December - Bolinas, CA
  • Average sunshine days in December: 18.7 days

Months with the most sunshine days are June and July (24.8 days).
The month with the least sunshine days is March (16.6 days).

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Average UV index in December
Bolinas, CA

Average UV index in December - Bolinas, CA
  • Average UV index in December: 3

Months with the highest UV index are June, July, August and September (UV index 5).
Months with the lowest UV index are February, November and December (UV index 3).

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Average cloud cover in December
Bolinas, CA

Average cloud cover in December - Bolinas, CA
  • Average cloud cover in December: 37

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
Bolinas, CA

Average visibility in December - Bolinas, CA
  • Average visibility in December: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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