December weather forecast and climate
Moss Beach, CA

Weather in December

The first month of the winter, December, is still a mild month in Moss Beach, California, with average temperature varying between 48.9°F (9.4°C) and 55.6°F (13.1°C).

Temperature

With an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 48.9°F (9.4°C), December is the coldest month.

Humidity

Months with the lowest humidity in Moss Beach are November and December, with an average relative humidity of 72%.

Rainfall

In Moss Beach, it is raining for 8.8 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, there are 77.3 rainfall days, and 6.81" (173mm) of precipitation is accumulated.

Ocean temperature

In December, the average ocean temperature is 54.3°F (12.4°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

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

Sunshine

December has the least sunshine of the year in Moss Beach, with an average of 5.7h of sunshine.

UV index

Months with the lowest UV index are February and December, with an average maximum UV index of 3. A UV Index estimate of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 3 in December interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Moss Beach?

December is the coldest month in Moss Beach, with an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 48.9°F (9.4°C).

What is the temperature in December in Moss Beach?

In Moss Beach, California, in December, the average high-temperature is 55.6°F (13.1°C), and the average low-temperature is 48.9°F (9.4°C).

What is the least humid month in Moss Beach?

November and December, with an average relative humidity of 72%, are the least humid months in Moss Beach.

What is the average humidity in December in Moss Beach?

The average relative humidity in December in Moss Beach is 72%.

How many days does it rain in December in Moss Beach?

In December, in Moss Beach, California, the rain falls for 8.8 days. Throughout December, 1.1" (28mm) of precipitation is accumulated.

How cold is the water in December in Moss Beach?

In Moss Beach, the average seawater temperature in December is 54.3°F (12.4°C). 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.

What is the month with the shortest days in Moss Beach?

The month with the shortest days in Moss Beach is December, with an average of 9.6h of daylight.

What is the average length of the day in December in Moss Beach?

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

What is the month with the least sunshine in Moss Beach?

The month with the least sunshine in Moss Beach is December, with an average of 5.7h of sunshine.

How many hours of sunshine does Moss Beach have in December?

In Moss Beach, the average sunshine in December is 5.7h.

What is the month with the lowest UV index in Moss Beach?

February and December, with an average maximum UV index of 3, are months with the lowest UV index in Moss Beach, California.

What is the UV index intensity in December in Moss Beach?

In December, the average daily maximum UV index in Moss Beach, California, is 3. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.

Average temperature in December
Moss Beach, CA

Average temperature in December - Moss Beach, CA
  • Average high temperature in December: 55.6°F

The warmest month (with the highest average high temperature) is September (67.5°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in December: 48.9°F

The month with the highest average low temperature is September (56.8°F).
The coldest months (with the lowest average low temperature) are January and February (48.7°F).

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Average pressure in December
Moss Beach, CA

Average pressure in December - Moss Beach, 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 September (29.92").

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Average wind speed in December
Moss Beach, CA

Average wind speed in December - Moss Beach, CA
  • Average wind speed in December: 8.1mph

The windiest month (with the highest average wind speed) is April (9.4mph).
The calmest months (with the lowest average wind speed) are August and September (6.8mph).

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Average humidity in December
Moss Beach, CA

Average humidity in December - Moss Beach, CA
  • Average humidity in December: 72%

The month with the highest relative humidity is August (82%).
Months with the lowest relative humidity are November and December (72%).

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Average rainfall in December
Moss Beach, CA

Average rainfall in December - Moss Beach, CA
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is February (1.34").
The driest months (with the least rainfall) are June, July and September (0.12").

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Average rainfall days in December
Moss Beach, CA

Average rainfall days in December - Moss Beach, CA
  • Average rainfall days in December: 8.8 days

The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is September (3.6 days).

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Average sea temperature in December
Moss Beach, CA

Average sea temperature in December - Moss Beach, 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
Moss Beach, CA

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

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 5.7h

The month with the most sunshine is July (Average sunshine: 11.1h).
The month with the least sunshine is December (Average sunshine: 5.7h).

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Average sunshine days in December
Moss Beach, CA

Average sunshine days in December - Moss Beach, CA
  • Average sunshine days in December: 20.7 days

The month with the most sunshine days is October (24.5 days).
The month with the least sunshine days is August (18.7 days).

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Average UV index in December
Moss Beach, CA

Average UV index in December - Moss Beach, CA
  • Average UV index in December: 3

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

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Average cloud cover in December
Moss Beach, CA

Average cloud cover in December - Moss Beach, CA
  • Average cloud cover in December: 36

The month with the most cloud cover is March (Cloud cover 39).
Months with the least cloud cover are September and October (Cloud cover 21).

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Average visibility in December
Moss Beach, CA

Average visibility in December - Moss Beach, 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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