December weather forecast and climate
San Jose, CA

A sunset panorama of the lit city of San Jose, California
A sunset panorama of the lit city of San Jose, California

Weather in December

December, the first month of the winter, in San Jose, is also a moderate month, with average temperature ranging between min 43°F (6.1°C) and max 56.5°F (13.6°C).

Temperature

December is the coldest month, with an average high-temperature of 56.5°F (13.6°C) and an average low-temperature of 43°F (6.1°C).

Humidity

The average relative humidity in San Jose is 71%.

Rainfall

In December, the rain falls for 7.6 days. Throughout December, 0.71" (18mm) of precipitation is accumulated. In San Jose, during the entire year, the rain falls for 51.5 days and collects up to 4.06" (103mm) of precipitation.

Daylight

December has the shortest days of the year, with an average of 9.6h of daylight.

Sunshine

The month with the least sunshine in San Jose is December, 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. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to the UV radiation for the average person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the coldest month in San Jose?

December is the coldest month in San Jose, California, with an average high-temperature of 56.5°F (13.6°C) and an average low-temperature of 43°F (6.1°C).

What is the temperature in December in San Jose?

The average high-temperature, in December, is 56.5°F (13.6°C), while the average low-temperature is 43°F (6.1°C).

What is the average humidity in December in San Jose?

In December, the average relative humidity is 71%.

How many days does it rain in December in San Jose?

In December, the rain falls for 7.6 days. Throughout December, 0.71" (18mm) of precipitation is accumulated.

What is the month with the shortest days in San Jose?

The month with the shortest days is December, with an average of 9.6h of daylight.

What is the average length of the day in December in San Jose?

The average length of the day in December in San Jose, California, is 9.6h.

What is the month with the least sunshine in San Jose?

December has the least sunshine of the year in San Jose, California, with an average of 6h of sunshine.

How long on average sun shines in December in San Jose?

The average sunshine in December in San Jose, California, is 6h.

When is the lowest UV index in San Jose?

Months with the lowest UV index are January, February, November and December, with an average maximum UV index of 3.

How high is the UV index in December in San Jose?

The average daily maximum UV index in December in San Jose, California, is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from the exposure to the Sun's UV rays.

Average temperature in December
San Jose, CA

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).

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Average pressure in December
San Jose, CA

Average pressure in December - San Jose, CA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.13").
Months with the lowest atmospheric pressure are June, August and September (29.92").

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Average wind speed in December
San Jose, CA

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).

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Average humidity in December
San Jose, CA

Average humidity in December - San Jose, CA
  • Average humidity in December: 71%

The month with the highest relative humidity is March (73%).
Months with the lowest relative humidity are July and September (60%).

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Average rainfall in December
San Jose, CA

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").

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Average rainfall days in December
San Jose, CA

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).

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Average daylight in December /
Average sunshine in December
San Jose, CA

Average daylight in December / Average sunshine in December - San Jose, CA
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 6h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6h).

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Average sunshine days in December
San Jose, CA

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).

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Average UV index in December
San Jose, CA

Average UV index in December - San Jose, CA
  • Average UV index in December: 3

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
San Jose, CA

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).

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Average visibility in December
San Jose, CA

Average visibility in December - San Jose, 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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