December weather forecast and climate
Antioch, CA

A high bridge passing over the famous San Joaquin River Delta in Antioch, California
A high bridge passing over the famous San Joaquin River Delta in Antioch, California

Weather in December

December, the first month of the winter, in Antioch, is also a fresh month, with average temperature varying between 55°F (12.8°C) and 41.7°F (5.4°C).

Temperature

With an average high-temperature of 55°F (12.8°C) and an average low-temperature of 41.7°F (5.4°C), December is the coldest month.

Humidity

In Antioch, the average relative humidity is 71%.

Rainfall

In Antioch, in December, during 9.3 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. Throughout the year, in Antioch, there are 62 rainfall days, and 10.16" (258mm) of precipitation is accumulated.

Snowfall

The only month with snowfall is December. December has the most snowfall days of the year. Snow falls for 0.1 days.

Daylight

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

Sunshine

With an average of 5.8h of sunshine, December has the least sunshine of the year.

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 medium health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 3 in December interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Antioch?

With an average high-temperature of 55°F (12.8°C) and an average low-temperature of 41.7°F (5.4°C), December is the coldest month in Antioch, California.

What is the temperature in December in Antioch?

The average high-temperature, in December, in Antioch, is 55°F (12.8°C), while the average low-temperature is 41.7°F (5.4°C).

What is the average humidity in December in Antioch?

In December, the average relative humidity is 71%.

How much does it rain in Antioch in December?

In Antioch, California, in December, during 9.3 rainfall days, 1.57" (40mm) of precipitation is typically accumulated.

When does it start to snow in Antioch?

December is the first month it typically snows. Throughout December, there are 0.1 snowfall days.

When does it snow the most in Antioch?

December has the most snowfall days of the year in Antioch, California. Snow falls for 0.1 days.

What is the month with the shortest days in Antioch?

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

What is the average length of the day in December in Antioch?

In Antioch, the average length of the day in December is 9.6h.

What is the month with the least sunshine in Antioch?

The month with the least sunshine in Antioch is December, with an average of 5.8h of sunshine.

How long on average sun shines in December in Antioch?

In Antioch, California, the average sunshine in December is 5.8h.

What is the month with the lowest UV index in Antioch?

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

How high is the UV index in December in Antioch?

In Antioch, California, the average daily maximum UV index in December is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV rays.

Average temperature in December
Antioch, CA

Average temperature in December - Antioch, CA
  • Average high temperature in December: 55°F

The warmest month (with the highest average high temperature) is July (88.5°F).
The month with the lowest average high temperature is December (55°F).

  • Average low temperature in December: 41.7°F

The month with the highest average low temperature is September (57.7°F).
The coldest month (with the lowest average low temperature) is January (41.5°F).

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Average pressure in December
Antioch, CA

Average pressure in December - Antioch, CA
  • Average pressure in December: 30.11"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.91").

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Average wind speed in December
Antioch, CA

Average wind speed in December - Antioch, CA
  • Average wind speed in December: 5mph

The windiest month (with the highest average wind speed) is June (7.8mph).
The calmest months (with the lowest average wind speed) are January and November (4.5mph).

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Average humidity in December
Antioch, CA

Average humidity in December - Antioch, CA
  • Average humidity in December: 71%

The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is September (52%).

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Average rainfall in December
Antioch, CA

Average rainfall in December - Antioch, CA
  • Average rainfall in December: 1.57"

The wettest month (with the highest rainfall) is February (2.09").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Antioch, CA

Average rainfall days in December - Antioch, CA
  • Average rainfall days in December: 9.3 days

The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (0.8 days).

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Average snowfall days in December
Antioch, CA

Average snowfall days in December - Antioch, CA
  • Average snowfall days in December: 0.1 days

The month with the highest number of snowfall days is December (0.1 days).
Months with the least snowfall days are January, February, March, April, May, June, July, August, September, October and November (0 days).

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Average daylight in December /
Average sunshine in December
Antioch, CA

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

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 5.8h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 5.8h).

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Average sunshine days in December
Antioch, CA

Average sunshine days in December - Antioch, CA
  • Average sunshine days in December: 21.1 days

The month with the most sunshine days is August (29.8 days).
The month with the least sunshine days is March (17.7 days).

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Average UV index in December
Antioch, CA

Average UV index in December - Antioch, 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
Antioch, CA

Average cloud cover in December - Antioch, CA
  • Average cloud cover in December: 35

Months with the most cloud cover are March and December (Cloud cover 35).
The month with the least cloud cover is July (Cloud cover 5).

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Average visibility in December
Antioch, CA

Average visibility in December - Antioch, 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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