Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
In San Jose, the lowest average temperatures are observed in December, with a high of 56.5°F (13.6°C) and a low of 43°F (6.1°C).Humidity
In December, the average relative humidity in San Jose is 71%.Rainfall
In San Jose, in December, during 7.6 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. Throughout the year, there are 51.5 rainfall days, and 4.06" (103mm) of precipitation is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 36min of daylight.On the first day of December, sunrise is at 7:03 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 5:00 pm PST.
Sunshine
December has the least sunshine of the year, with an average of 6h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index in San Jose. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: In December, the average maximum UV index of 3 translates into the following recommendations:
Heed the precautions - It is counselled to guard against solar damage. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the coldest time of year?
What is the temperature in December?
What is the average humidity in December?
How many days does it rain in December?
What is the month with the shortest days?
What is the average length of the day in December?
When are sunrise and sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does San Jose have in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
San Jose, CA
- Average high temperature in December: 56.5°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is December (56.5°F).
- Average low temperature in December: 43°F
The month with the highest average low temperature is August (56.5°F).
The coldest month (with the lowest average low temperature) is December (43°F).
Average pressure in December
San Jose, CA
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.92"Hg).
Average wind speed in December
San Jose, CA
- Average wind speed in December: 5mph
The windiest months (with the highest average wind speed) are April and May (5.8mph).
The calmest months (with the lowest average wind speed) are September and October (4.4mph).
Average humidity in December
San Jose, CA
- Average humidity in December: 71%
The month with the highest relative humidity is March (73%).
The months with the lowest relative humidity are July and September (60%).
Average rainfall in December
San Jose, CA
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is March (0.83").
The driest months (with the least rainfall) are June, July and August (0.04").
Average rainfall days in December
San Jose, CA
- Average rainfall days in December: 7.6 days
The month with the highest number of rainy days is March (9.8 days).
The month with the least rainy days is August (0.4 days).
Average daylight in December /
Average sunshine in December
San Jose, CA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 6h and 0min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in December
San Jose, CA
- Average sunshine days in December: 22.3 days
The month with the most sunshine days is August (29.7 days).
The month with the least sunshine days is March (19.5 days).
Average UV index in December
San Jose, CA
- Average UV index in December: 3
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in December
San Jose, CA
- Average cloud cover in December: 33
The month with the most cloud cover is March (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 6).
Average visibility in December
San Jose, 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).
San Jose, California, USA
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