December weather forecast and climate
La Jolla, CA

Weather in December

The first month of the winter, December, is also an enjoyable month in La Jolla, California, with average temperature varying between 63.5°F (17.5°C) and 51.3°F (10.7°C).

Temperature

With an average high-temperature of 63.5°F (17.5°C) and an average low-temperature of 51.3°F (10.7°C), December is the coldest month.

Humidity

The average relative humidity in December is 61%.

Rainfall

In December, the rain falls for 5.7 days. Throughout December, 1.3" (33mm) of precipitation is accumulated. Throughout the year, there are 57.9 rainfall days, and 7.48" (190mm) of precipitation is accumulated.

Ocean temperature

In La Jolla, the average seawater temperature in December is 60.4°F (15.8°C).
Note: Swimming in 60.4°F (15.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

December has the shortest days of the year in La Jolla, with an average of 10h of daylight.

Sunshine

With an average of 6.8h of sunshine, December has the least sunshine of the year in La Jolla.

UV index

January through March, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 4 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. 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.
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FAQ

What is the coldest month in La Jolla?

With an average high-temperature of 63.5°F (17.5°C) and an average low-temperature of 51.3°F (10.7°C), December is the coldest month in La Jolla, California.

What is the temperature in December in La Jolla?

The average high-temperature, in December, in La Jolla, California, is 63.5°F (17.5°C), while the average low-temperature is 51.3°F (10.7°C).

What is the average humidity in December in La Jolla?

In La Jolla, the average relative humidity in December is 61%.

How much does it rain in La Jolla in December?

In La Jolla, California, in December, during 5.7 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

What is the ocean temperature in December in La Jolla?

In December, the average ocean temperature is 60.4°F (15.8°C). Swimming in 60.4°F (15.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

What is the month with the shortest days in La Jolla?

With an average of 10h of daylight, December has the shortest days of the year.

How many hours of daylight does La Jolla have in December?

In December, the average length of the day is 10h.

What is the month with the least sunshine in La Jolla?

December has the least sunshine of the year, with an average of 6.8h of sunshine.

How long on average sun shines in December in La Jolla?

The average sunshine in December in La Jolla, California, is 6.8h.

What are the months with the lowest UV index in La Jolla?

Months with the lowest UV index in La Jolla are January through March, November and December, with an average maximum UV index of 4.

What is the UV index intensity in December in La Jolla?

In La Jolla, the average daily maximum UV index in December is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
La Jolla, CA

Average temperature in December - La Jolla, CA
  • Average high temperature in December: 63.5°F

The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (63.5°F).

  • Average low temperature in December: 51.3°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).

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Average pressure in December
La Jolla, CA

Average pressure in December - La Jolla, CA
  • Average pressure in December: 30.06"

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are June and September (29.88").

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Average wind speed in December
La Jolla, CA

Average wind speed in December - La Jolla, CA
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).

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Average humidity in December
La Jolla, CA

Average humidity in December - La Jolla, CA
  • Average humidity in December: 61%

Months with the highest relative humidity are May and June (71%).
The month with the lowest relative humidity is November (57%).

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Average rainfall in December
La Jolla, CA

Average rainfall in December - La Jolla, CA
  • Average rainfall in December: 1.3"

The wettest month (with the highest rainfall) is February (1.46").
The driest month (with the least rainfall) is June (0.12").

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Average rainfall days in December
La Jolla, CA

Average rainfall days in December - La Jolla, CA
  • Average rainfall days in December: 5.7 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (2.2 days).

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Average sea temperature in December
La Jolla, CA

Average sea temperature in December - La Jolla, CA
  • Average sea temperature in December: 60.4°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (58.7°F).

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Average daylight in December /
Average sunshine in December
La Jolla, CA

Average daylight in December / Average sunshine in December - La Jolla, CA
  • Average daylight in December: 10h

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in December: 6.8h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.8h).

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Average sunshine days in December
La Jolla, CA

Average sunshine days in December - La Jolla, CA
  • Average sunshine days in December: 22.8 days

The month with the most sunshine days is January (24.8 days).
The month with the least sunshine days is February (20.2 days).

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Average UV index in December
La Jolla, CA

Average UV index in December - La Jolla, CA
  • Average UV index in December: 4

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

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Average cloud cover in December
La Jolla, CA

Average cloud cover in December - La Jolla, 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
La Jolla, CA

Average visibility in December - La Jolla, 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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