December weather forecast and climate
Chico, CA

Dense forest and a bridge crossing over the famed Big Chico Creek located in the Bidwell Park in Chico, California
Dense forest and a bridge crossing over the famed Big Chico Creek located in the Bidwell Park in Chico, California

Weather in December

December, the first month of the winter, in Chico, is also a fresh month, with average temperature fluctuating between 39°F (3.9°C) and 53.2°F (11.8°C).

Temperature

December is the coldest month, with an average high-temperature of 53.2°F (11.8°C) and an average low-temperature of 39°F (3.9°C).

Humidity

The average relative humidity in Chico, California, is 67%.

Rainfall

In December, in Chico, the rain falls for 11.5 days. Throughout December, 3.9" (99mm) of precipitation is accumulated. Throughout the year, in Chico, California, there are 90.7 rainfall days, and 21.81" (554mm) of precipitation is accumulated.

Snowfall

The only month with snowfall is December. The month with the most snowfall in Chico is December when snow falls for 0.4 days and typically aggregates up to 0.12" (3mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9.4h of daylight.

Sunshine

Months with the least sunshine are January and December, with an average of 5.9h 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 Chico. A UV Index value of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Chico?

December is the coldest month, with an average high-temperature of 53.2°F (11.8°C) and an average low-temperature of 39°F (3.9°C).

What is the temperature in December in Chico?

In Chico, in December, the average high-temperature is 53.2°F (11.8°C), and the average low-temperature is 39°F (3.9°C).

What is the average humidity in December in Chico?

In Chico, California, the average relative humidity in December is 67%.

How many days does it rain in December in Chico?

In December, in Chico, California, the rain falls for 11.5 days. Throughout December, 3.9" (99mm) of precipitation is accumulated.

When does it start to snow in Chico?

December is the first month it typically snows in Chico. Throughout December, in the average 0.4 snowfall days, it receives 0.12" (3mm) of snow.

When does it snow the most in Chico?

December is the month with the most snowfall. Snow falls for 0.4 days and accumulates 0.12" (3mm) of snow.

What is the month with the shortest days in Chico?

December has the shortest days of the year, with an average of 9.4h of daylight.

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

In December, the average length of the day in Chico, California, is 9.4h.

What is the month with the least sunshine in Chico?

Months with the least sunshine are January and December, with an average of 5.9h of sunshine.

How long on average sun shines in December in Chico?

The average sunshine in December in Chico is 5.9h.

What are the months with the lowest UV index in Chico?

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 Chico?

In December, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Chico, CA

Average temperature in December - Chico, CA
  • Average high temperature in December: 53.2°F

The warmest month (with the highest average high temperature) is July (95.2°F).
The month with the lowest average high temperature is December (53.2°F).

  • Average low temperature in December: 39°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is December (39°F).

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Average pressure in December
Chico, CA

Average pressure in December - Chico, CA
  • Average pressure in December: 30.14"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in December
Chico, CA

Average wind speed in December - Chico, CA
  • Average wind speed in December: 5.7mph

The windiest month (with the highest average wind speed) is March (6.8mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

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Average humidity in December
Chico, CA

Average humidity in December - Chico, CA
  • Average humidity in December: 67%

The month with the highest relative humidity is March (72%).
The month with the lowest relative humidity is July (32%).

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Average rainfall in December
Chico, CA

Average rainfall in December - Chico, CA
  • Average rainfall in December: 3.9"

The wettest month (with the highest rainfall) is February (3.94").
The driest month (with the least rainfall) is July (0.08").

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Average rainfall days in December
Chico, CA

Average rainfall days in December - Chico, CA
  • Average rainfall days in December: 11.5 days

The month with the highest number of rainy days is March (15.2 days).
The month with the least rainy days is August (1.9 days).

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Average snowfall in December
Chico, CA

Average snowfall in December - Chico, CA
  • Average snowfall in December: 0.12"

The month with the highest snowfall is December (0.12").
Months with the least snowfall are January, February, March, April, May, June, July, August, September, October and November (0").

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Average snowfall days in December
Chico, CA

Average snowfall days in December - Chico, CA
  • Average snowfall days in December: 0.4 days

The month with the highest number of snowfall days is December (0.4 days).
Months with the least snowfall days are January, March, April, May, June, July, August, September, October and November (0 days).

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

Average daylight in December / Average sunshine in December - Chico, CA
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 5.9h

The month with the most sunshine is July (Average sunshine: 12.2h).
Months with the least sunshine are January and December (Average sunshine: 5.9).

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Average sunshine days in December
Chico, CA

Average sunshine days in December - Chico, CA
  • Average sunshine days in December: 17.8 days

The month with the most sunshine days is August (28.1 days).
The month with the least sunshine days is March (14.9 days).

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Average UV index in December
Chico, CA

Average UV index in December - Chico, CA
  • Average UV index in December: 3

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Chico, CA

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

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in December
Chico, CA

Average visibility in December - Chico, 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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