December weather forecastLa Mesa, CA
December
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 La Mesa's coldest month, registering average high temperatures of 64.2°F (17.9°C) and lows of 49.1°F (9.5°C).Humidity
In December, the average relative humidity is 59%.Rainfall
In December, the rain falls for 5.7 days. Throughout December, 1.06" (27mm) of precipitation is accumulated. Throughout the year, there are 54.5 rainfall days, and 6.57" (167mm) of precipitation is accumulated.Daylight
The month with the shortest days is December, with an average of 10h and 0min of daylight.On the first day of the month, sunrise is at 6:33 am and sunset at 4:41 pm. On the last day of December, sunrise is at 6:50 am and sunset at 4:52 pm PST.
Sunshine
With an average of 6.7h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the maximum UV index of 4 suggests this advice:
Guard yourself - Precautionary measures against sun damage are advocated. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in December
La Mesa, CA
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
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).
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%).
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").
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).
Average daylight in December /
Average sunshine in December
La Mesa, CA
- Average daylight in December: 10h and 0min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in December: 6h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
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).
Average UV index in December
La Mesa, CA
- Average UV index in December: 4
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 4).
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).
Average visibility in December
La Mesa, CA
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
