December weather forecast and climate
Santa Monica, CA

The neon-lit fun park in Santa Monica, California, with a view of the iconic Ferris wheel and pier
The neon-lit fun park in Santa Monica, California, with a view of the iconic Ferris wheel and pier

Weather in December

The first month of the winter, December, is still a comfortable month in Santa Monica, California, with average temperature ranging between max 63.9°F (17.7°C) and min 50.7°F (10.4°C).

Temperature

The coldest month is December, with an average high-temperature of 63.9°F (17.7°C) and an average low-temperature of 50.7°F (10.4°C).

Humidity

In December, the average relative humidity in Santa Monica, California, is 55%.

Rainfall

In Santa Monica, during December, the rain falls for 5.2 days and regularly aggregates up to 1.26" (32mm) of precipitation. Throughout the year, there are 48.8 rainfall days, and 7.52" (191mm) of precipitation is accumulated.

Ocean temperature

January through May and December, with an average ocean temperature of 59°F (15°C), are months with the coldest seawater.
Note: For most, swimming in 59°F (15°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

Daylight

December has the shortest days of the year, with an average of 9.9h of daylight.

Sunshine

February and December, with an average of 6.6h of sunshine, are months with the least sunshine.

UV index

January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 Santa Monica?

December is the coldest month in Santa Monica, California, with an average high-temperature of 63.9°F (17.7°C) and an average low-temperature of 50.7°F (10.4°C).

What is the temperature in December in Santa Monica?

In December, in Santa Monica, California, the average high-temperature is 63.9°F (17.7°C), and the average low-temperature is 50.7°F (10.4°C).

What is the average humidity in December in Santa Monica?

In Santa Monica, the average relative humidity in December is 55%.

How much does it rain in Santa Monica in December?

In Santa Monica, in December, it is raining for 5.2 days, with typically 1.26" (32mm) of accumulated precipitation.

What are the months with the coldest ocean in Santa Monica?

January through May and December, with an average ocean temperature of 59°F (15°C), are months with the coldest seawater.

What is the ocean temperature in December in Santa Monica?

In Santa Monica, in December, the average water temperature is 59°F (15°C). For most, swimming in 59°F (15°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the month with the shortest days in Santa Monica?

December has the shortest days of the year in Santa Monica, California, with an average of 9.9h of daylight.

What is the average length of the day in December in Santa Monica?

The average length of the day in December in Santa Monica, California, is 9.9h.

What is the month with the least sunshine in Santa Monica?

Months with the least sunshine in Santa Monica are February and December, with an average of 6.6h of sunshine.

How long on average sun shines in December in Santa Monica?

The average sunshine in December in Santa Monica, California, is 6.6h.

What is the month with the lowest UV index in Santa Monica?

Months with the lowest UV index in Santa Monica, California, are January, February, November and December, with an average maximum UV index of 4.

What is the UV index intensity in December in Santa Monica?

The average daily maximum UV index in December in Santa Monica, California, is 4. A UV Index value of 3 to 5 symbolizes a medium hazard to health from unsafe exposure to the Sun's UV rays.

Average temperature in December
Santa Monica, CA

Average temperature in December - Santa Monica, CA
  • Average high temperature in December: 63.9°F

The warmest month (with the highest average high temperature) is August (80.8°F).
The month with the lowest average high temperature is December (63.9°F).

  • Average low temperature in December: 50.7°F

The month with the highest average low temperature is August (64.4°F).
The coldest month (with the lowest average low temperature) is February (50.5°F).

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Average pressure in December
Santa Monica, CA

Average pressure in December - Santa Monica, CA
  • Average pressure in December: 30.08"

The month with the highest atmospheric pressure is January (30.1").
Months with the lowest atmospheric pressure are June and September (29.9").

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Average wind speed in December
Santa Monica, CA

Average wind speed in December - Santa Monica, CA
  • Average wind speed in December: 5.8mph

The windiest month (with the highest average wind speed) is April (6.3mph).
The calmest months (with the lowest average wind speed) are August and September (4.8mph).

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Average humidity in December
Santa Monica, CA

Average humidity in December - Santa Monica, CA
  • Average humidity in December: 55%

The month with the highest relative humidity is June (69%).
The month with the lowest relative humidity is November (52%).

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Average rainfall in December
Santa Monica, CA

Average rainfall in December - Santa Monica, CA
  • Average rainfall in December: 1.26"

The wettest month (with the highest rainfall) is January (1.54").
The driest months (with the least rainfall) are June and August (0.08").

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Average rainfall days in December
Santa Monica, CA

Average rainfall days in December - Santa Monica, CA
  • Average rainfall days in December: 5.2 days

The month with the highest number of rainy days is March (6.8 days).
The month with the least rainy days is August (1.8 days).

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Average sea temperature in December
Santa Monica, CA

Average sea temperature in December - Santa Monica, CA
  • Average sea temperature in December: 59°F

The best months for swimming (with the highest average sea temperature) are August, September and October (66°F).
The coldest months (with the lowest average sea temperature) are January, February, March, April, May and December (59°F).

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Average daylight in December /
Average sunshine in December
Santa Monica, CA

Average daylight in December / Average sunshine in December - Santa Monica, CA
  • Average daylight in December: 9.9h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 9.9h).

  • Average sunshine in December: 6.6h

Months with the most sunshine are July and August (Average sunshine: 11.9h).
Months with the least sunshine are February and December (Average sunshine: 6.6).

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Average sunshine days in December
Santa Monica, CA

Average sunshine days in December - Santa Monica, CA
  • Average sunshine days in December: 24.1 days

The month with the most sunshine days is August (27.9 days).
The month with the least sunshine days is February (21.8 days).

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Average UV index in December
Santa Monica, CA

Average UV index in December - Santa Monica, CA
  • Average UV index in December: 4

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in December
Santa Monica, CA

Average cloud cover in December - Santa Monica, CA
  • Average cloud cover in December: 23

Months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in December
Santa Monica, CA

Average visibility in December - Santa Monica, 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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