December weather forecast and climate
La Mesa, CA

Weather in December

December, the first month of the winter, in La Mesa, is also an enjoyable month, with temperature in the range of an average low of 49.1°F (9.5°C) and an average high of 64.2°F (17.9°C).

Temperature

December is the coldest month, with an average high-temperature of 64.2°F (17.9°C) and an average low-temperature of 49.1°F (9.5°C).

Humidity

The average relative humidity in La Mesa is 59%.

Rainfall

In La Mesa, California, during December, the rain falls for 5.7 days and regularly aggregates up to 1.06" (27mm) of precipitation. Throughout the year, in La Mesa, there are 54.5 rainfall days, and 6.57" (167mm) of precipitation is accumulated.

Daylight

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

Sunshine

December has the least sunshine of the year in La Mesa, with an average of 6.7h of sunshine.

UV index

Months with the lowest UV index in La Mesa are January, February, November and December, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 4 in December interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. 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 La Mesa?

December is the coldest month in La Mesa, California, with an average high-temperature of 64.2°F (17.9°C) and an average low-temperature of 49.1°F (9.5°C).

What is the temperature in December in La Mesa?

In December, the average high-temperature is 64.2°F (17.9°C), and the average low-temperature is 49.1°F (9.5°C).

What is the average humidity in December in La Mesa?

In La Mesa, the average relative humidity in December is 59%.

How many days does it rain in December in La Mesa?

In La Mesa, California, in December, during 5.7 rainfall days, 1.06" (27mm) of precipitation is typically accumulated.

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

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

What is the average length of the day in December in La Mesa?

In La Mesa, California, the average length of the day in December is 10h.

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

With an average of 6.7h of sunshine, December has the least sunshine of the year.

How many hours of sunshine does La Mesa have in December?

In December, the average sunshine in La Mesa, California, is 6.7h.

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

January, February, November and December, with an average maximum UV index of 4, are months with the lowest UV index in La Mesa.

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

In La Mesa, the average daily maximum UV index in December is 4. 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
La Mesa, CA

Average temperature in December - La Mesa, CA
  • Average high temperature in December: 64.2°F

The warmest month (with the highest average high temperature) is August (82.6°F).
The month with the lowest average high temperature is December (64.2°F).

  • Average low temperature in December: 49.1°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 (48.7°F).

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Average pressure in December
La Mesa, CA

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

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in December
La Mesa, CA

Average wind speed in December - La Mesa, CA
  • Average wind speed in December: 5mph

The windiest month (with the highest average wind speed) is April (5.7mph).
The calmest month (with the lowest average wind speed) is October (4.5mph).

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Average humidity in December
La Mesa, CA

Average humidity in December - La Mesa, CA
  • Average humidity in December: 59%

The month with the highest relative humidity is May (68%).
The month with the lowest relative humidity is November (55%).

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Average rainfall in December
La Mesa, CA

Average rainfall in December - La Mesa, CA
  • Average rainfall in December: 1.06"

The wettest month (with the highest rainfall) is February (1.3").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in December
La Mesa, CA

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

The month with the highest number of rainy days is March (7.8 days).
The month with the least rainy days is June (1.4 days).

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

Average daylight in December / Average sunshine in December - La Mesa, 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: 6.7h

The month with the most sunshine is July (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in December
La Mesa, CA

Average sunshine days in December - La Mesa, CA
  • Average sunshine days in December: 23.7 days

The month with the most sunshine days is June (28.1 days).
The month with the least sunshine days is February (21 days).

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Average UV index in December
La Mesa, CA

Average UV index in December - La Mesa, 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
La Mesa, CA

Average cloud cover in December - La Mesa, CA
  • Average cloud cover in December: 23

The month with the most cloud cover is March (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in December
La Mesa, CA

Average visibility in December - La Mesa, 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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