December weather forecast and climate
Gridley, CA

Weather in December

The first month of the winter, December, is still a cool month in Gridley, California, with average temperature varying between 54.5°F (12.5°C) and 41°F (5°C).

Temperature

The coldest month is December, with an average high-temperature of 54.5°F (12.5°C) and an average low-temperature of 41°F (5°C).

Humidity

In December, the average relative humidity in Gridley is 68%.

Rainfall

In Gridley, California, during December, the rain falls for 11.3 days and regularly aggregates up to 3.7" (94mm) of precipitation. Throughout the year, there are 81.5 rainfall days, and 21.34" (542mm) of precipitation is accumulated.

Snowfall

March through December are months without snowfall in Gridley.

Daylight

The month with the shortest days is December, with an average of 9.4h of daylight.

Sunshine

December has the least sunshine of the year in Gridley, 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. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to the UV radiation for the ordinary person.
Note: The average daily UV index of 3 in December transform into the following instructions:
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. 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. 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 Gridley?

December is the coldest month in Gridley, California, with an average high-temperature of 54.5°F (12.5°C) and an average low-temperature of 41°F (5°C).

What is the temperature in December in Gridley?

In December, the average high-temperature is 54.5°F (12.5°C), and the average low-temperature is 41°F (5°C).

What is the average humidity in December in Gridley?

In Gridley, California, the average relative humidity in December is 68%.

How much does it rain in Gridley in December?

In Gridley, California, in December, during 11.3 rainfall days, 3.7" (94mm) of precipitation is typically accumulated.

Does it snow in Gridley in December?

In Gridley, California, in December, it doesn't snow. In January, it regularly snows.

When it does not snow in Gridley?

March through December are months without snowfall in Gridley, California.

What is the month with the shortest days in Gridley?

With an average of 9.4h of daylight, December has the shortest days of the year in Gridley, California.

How many hours of daylight does Gridley have in December?

The average length of the day in December is 9.4h.

What is the month with the least sunshine in Gridley?

December has the least sunshine of the year, with an average of 5.9h of sunshine.

How long on average sun shines in December in Gridley?

In December, the average sunshine is 5.9h.

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

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

What is the UV index intensity in December in Gridley?

The average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from the exposure to the Sun's UV radiation.

Average temperature in December
Gridley, CA

Average temperature in December - Gridley, CA
  • Average high temperature in December: 54.5°F

The warmest month (with the highest average high temperature) is July (96.4°F).
The month with the lowest average high temperature is December (54.5°F).

  • Average low temperature in December: 41°F

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is December (41°F).

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Average pressure in December
Gridley, CA

Average pressure in December - Gridley, CA
  • Average pressure in December: 30.13"

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
Gridley, CA

Average wind speed in December - Gridley, CA
  • Average wind speed in December: 5.2mph

The windiest month (with the highest average wind speed) is March (6.1mph).
The calmest month (with the lowest average wind speed) is September (4.7mph).

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Average humidity in December
Gridley, CA

Average humidity in December - Gridley, CA
  • Average humidity in December: 68%

The month with the highest relative humidity is March (72%).
The month with the lowest relative humidity is July (35%).

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Average rainfall in December
Gridley, CA

Average rainfall in December - Gridley, CA
  • Average rainfall in December: 3.7"

The wettest months (with the highest rainfall) are February and March (3.98").
The driest month (with the least rainfall) is July (0.04").

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Average rainfall days in December
Gridley, CA

Average rainfall days in December - Gridley, CA
  • Average rainfall days in December: 11.3 days

The month with the highest number of rainy days is March (14.3 days).
The month with the least rainy days is July (1.4 days).

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Average snowfall in December
Gridley, CA

Average snowfall in December - Gridley, CA
  • Average snowfall in December: 0"

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

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Average snowfall days in December
Gridley, CA

Average snowfall days in December - Gridley, 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
Gridley, CA

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

The month with the longest days is June (Average daylight: 14.9h).
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).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days in December
Gridley, CA

Average sunshine days in December - Gridley, CA
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is July (29.1 days).
The month with the least sunshine days is March (16 days).

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Average UV index in December
Gridley, CA

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

Months with the highest UV index are June, July and August (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
Gridley, CA

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

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).

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Average visibility in December
Gridley, CA

Average visibility in December - Gridley, 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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