December weather forecastTierrasanta, CA
December
Weather in December
The first month of the winter, December, is still a refreshing month in Tierrasanta, California, with an average temperature ranging between max 63.5°F (17.5°C) and min 51.3°F (10.7°C).Temperature
In Tierrasanta, December is the coldest month, with temperatures averaging a high of 63.5°F (17.5°C) and a low of 51.3°F (10.7°C).Humidity
The average relative humidity in December in Tierrasanta is 61%.Rainfall
In Tierrasanta, California, in December, it is raining for 5.7 days, with typically 1.3" (33mm) of accumulated precipitation. In Tierrasanta, during the entire year, the rain falls for 57.9 days and collects up to 7.48" (190mm) of precipitation.Daylight
December has the shortest days of the year, 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, in Tierrasanta, sunrise is at 6:50 am and sunset at 4:52 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 6.8h of sunshine.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 medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily high UV index of 4 in December leads to these guidelines:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Tierrasanta, 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
Tierrasanta, 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
Tierrasanta, 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
Tierrasanta, 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
Tierrasanta, 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
Tierrasanta, 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 daylight in December /
Average sunshine in December
Tierrasanta, 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
Tierrasanta, 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
Tierrasanta, 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
Tierrasanta, 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
Tierrasanta, 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).
