December weather forecastLa Jolla, CA
December
Weather in December
December, the first month of the winter in La Jolla, is also an enjoyable month, with an average temperature varying between 63.5°F (17.5°C) and 51.3°F (10.7°C).Temperature
Temperature readings reach their annual highs in December, averaging 63.5°F (17.5°C) and a minimum average of 51.3°F (10.7°C).Humidity
The average relative humidity in December is 61%.Rainfall
In La Jolla, California, in December, during 5.7 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. In La Jolla, California, during the entire year, the rain falls for 57.9 days and collects up to 7.48" (190mm) of precipitation.Ocean temperature
In December, the average ocean temperature is 60.4°F (15.8°C).Note: For most, swimming in 60.4°F (15.8°C) is not a pleasant activity. Breathing becomes increasingly challenging as water temperature descends from 69.8°F (21°C) to 59°F (15°C).
Daylight
With an average of 10h and 0min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 6:34 am and sunset at 4:42 pm. On the last day of December, in La Jolla, sunrise is at 6:51 am and sunset at 4:53 pm PST.
Sunshine
With an average of 6.8h of sunshine, December has the least sunshine of the year.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 value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for average individuals.Note: In December, the UV index of 4 transforms into the following advice:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in December
La Jolla, CA
- Average pressure in December: 30.06"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).
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).
Average humidity in December
La Jolla, CA
- Average humidity in December: 61%
The months with the highest relative humidity are May and June (71%).
The month with the lowest relative humidity is November (57%).
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").
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).
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).
Average daylight in December /
Average sunshine in December
La Jolla, 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 48min
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 48min).
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).
Average UV index in December
La Jolla, CA
- Average UV index in December: 4
The months with the highest UV index are July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in December
La Jolla, CA
- Average cloud cover in December: 23
The 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).
Average visibility in December
La Jolla, 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).
