December weather forecast and climate
Mendocino, CA

Weather in December

The first month of the winter, December, is still a cool month in Mendocino, California, with average temperature varying between 54.3°F (12.4°C) and 46.2°F (7.9°C).

Temperature

February and December, with an average high-temperature of 54.3°F (12.4°C), are the coldest months.

Humidity

In December, the average relative humidity is 76%.

Rainfall

The month with the most rainfall is December when the rain falls for 10.4 days and typically aggregates up to 1.77" (45mm) of precipitation.

Snowfall

In Mendocino snow does not fall in January, March through December.

Ocean temperature

In December, the average ocean temperature is 54.1°F (12.3°C).
Note: At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

Daylight

December has the shortest days of the year in Mendocino, California, with an average of 9.4h of daylight.

Sunshine

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

UV index

Months with the lowest UV index in Mendocino are January, February, November and December, with an average maximum UV index of 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 3 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the coldest month in Mendocino?

The coldest months are February and December, with an average high-temperature of 54.3°F (12.4°C).

What is the temperature in December in Mendocino?

In Mendocino, California, in December, the average high-temperature is 54.3°F (12.4°C), and the average low-temperature is 46.2°F (7.9°C).

What is the average humidity in December in Mendocino?

The average relative humidity in December in Mendocino, California, is 76%.

How much does it rain in Mendocino in December?

In Mendocino, California, in December, during 10.4 rainfall days, 1.77" (45mm) of precipitation is typically accumulated.

What is the wettest month in Mendocino?

The month with the most rainfall in Mendocino is December when the rain falls for 10.4 days and typically aggregates up to 1.77" (45mm) of precipitation.

When it does not snow in Mendocino?

In Mendocino, California, snow does not fall in January, March through December.

What is the water temperature in December in Mendocino?

In Mendocino, California, the average seawater temperature in December is 54.1°F (12.3°C). Swimming in 54.1°F (12.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Mendocino?

December has the shortest days of the year, with an average of 9.4h of daylight.

What is the average length of the day in December in Mendocino?

The average length of the day in December is 9.4h.

What is the month with the least sunshine in Mendocino?

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

How many hours of sunshine does Mendocino have in December?

The average sunshine in December in Mendocino is 5.5h.

What is the month with the lowest UV index in Mendocino?

Months with the lowest UV index in Mendocino, California, are January, February, November and December, with an average maximum UV index of 3.

What is the UV index intensity in December in Mendocino?

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

Average temperature in December
Mendocino, CA

Average temperature in December - Mendocino, CA
  • Average high temperature in December: 54.3°F

The warmest month (with the highest average high temperature) is September (67.5°F).
Months with the lowest average high temperature are February and December (54.3°F).

  • Average low temperature in December: 46.2°F

The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is February (45.5°F).

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Average pressure in December
Mendocino, CA

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

The month with the highest atmospheric pressure is January (30.13").
The month with the lowest atmospheric pressure is August (29.93").

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Average wind speed in December
Mendocino, CA

Average wind speed in December - Mendocino, CA
  • Average wind speed in December: 8.8mph

The windiest month (with the highest average wind speed) is June (10.9mph).
The calmest month (with the lowest average wind speed) is August (7.8mph).

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Average humidity in December
Mendocino, CA

Average humidity in December - Mendocino, CA
  • Average humidity in December: 76%

Months with the highest relative humidity are March, May and August (80%).
The month with the lowest relative humidity is October (75%).

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Average rainfall in December
Mendocino, CA

Average rainfall in December - Mendocino, CA
  • Average rainfall in December: 1.77"

The wettest month (with the highest rainfall) is December (1.77").
The driest months (with the least rainfall) are June, July and August (0.08").

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Average rainfall days in December
Mendocino, CA

Average rainfall days in December - Mendocino, CA
  • Average rainfall days in December: 10.4 days

The month with the highest number of rainy days is March (11.4 days).
Months with the least rainy days are June and August (1.8 days).

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Average snowfall in December
Mendocino, CA

Average snowfall in December - Mendocino, CA
  • Average snowfall in December: 0"

The month with the highest snowfall is February (0.04").
Months with the least snowfall are January, March, April, May, June, July, August, September, October, November and December (0").

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Average snowfall days in December
Mendocino, CA

Average snowfall days in December - Mendocino, CA
  • Average snowfall days in December: 0 days

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

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Average sea temperature in December
Mendocino, CA

Average sea temperature in December - Mendocino, CA
  • Average sea temperature in December: 54.2°F

The best month for swimming (with the highest average sea temperature) is October (55.6°F).
The coldest month (with the lowest average sea temperature) is April (52.1°F).

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

Average daylight in December / Average sunshine in December - Mendocino, CA
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 5.5h

Months with the most sunshine are July and August (Average sunshine: 11.8h).
The month with the least sunshine is December (Average sunshine: 5.5h).

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Average sunshine days in December
Mendocino, CA

Average sunshine days in December - Mendocino, CA
  • Average sunshine days in December: 19.7 days

The month with the most sunshine days is July (28.2 days).
The month with the least sunshine days is March (18.4 days).

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Average UV index in December
Mendocino, CA

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

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

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Average cloud cover in December
Mendocino, CA

Average cloud cover in December - Mendocino, CA
  • Average cloud cover in December: 39

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 10).

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Average visibility in December
Mendocino, CA

Average visibility in December - Mendocino, 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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