December weather forecast and climate
Posts, CA

Weather in December

December, the first month of the winter, in Posts, is still a mild month, with average temperature ranging between max 57°F (13.9°C) and min 46.9°F (8.3°C).

Temperature

With an average high-temperature of 57°F (13.9°C) and an average low-temperature of 46.9°F (8.3°C), December is the coldest month.

Humidity

In Posts, the average relative humidity in December is 72%.

Rainfall

The month with the most rainfall is December when the rain falls for 9.8 days and typically aggregates up to 2.48" (63mm) of precipitation.

Daylight

The month with the shortest days in Posts is December, with an average of 9.7h of daylight.

Sunshine

The month with the least sunshine is December, with an average of 5.9h of sunshine.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 3. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. 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 Posts?

With an average high-temperature of 57°F (13.9°C) and an average low-temperature of 46.9°F (8.3°C), December is the coldest month.

What is the temperature in December in Posts?

The average high-temperature, in December, in Posts, California, is 57°F (13.9°C), while the average low-temperature is 46.9°F (8.3°C).

What is the average humidity in December in Posts?

In Posts, California, the average relative humidity in December is 72%.

How many days does it rain in December in Posts?

In Posts, California, in December, during 9.8 rainfall days, 2.48" (63mm) of precipitation is typically accumulated.

What is the wettest month in Posts?

The month with the most rainfall in Posts, California, is December when the rain falls for 9.8 days and typically aggregates up to 2.48" (63mm) of precipitation.

What is the month with the shortest days in Posts?

With an average of 9.7h of daylight, December has the shortest days of the year in Posts.

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

In Posts, California, the average length of the day in December is 9.7h.

What is the month with the least sunshine in Posts?

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

How long on average sun shines in December in Posts?

In Posts, the average sunshine in December is 5.9h.

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

The month with the lowest UV index in Posts is December, with an average maximum UV index of 3.

What is the UV index reading in December in Posts?

In Posts, the average daily maximum UV index in December is 3. A UV Index of 3 to 5 symbolizes a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in December
Posts, CA

Average temperature in December - Posts, CA
  • Average high temperature in December: 57°F

The warmest month (with the highest average high temperature) is September (69.6°F).
The month with the lowest average high temperature is December (57°F).

  • Average low temperature in December: 46.9°F

The month with the highest average low temperature is September (55.4°F).
The coldest month (with the lowest average low temperature) is December (46.9°F).

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Average pressure in December
Posts, CA

Average pressure in December - Posts, 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 (29.93").

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Average wind speed in December
Posts, CA

Average wind speed in December - Posts, CA
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity in December
Posts, CA

Average humidity in December - Posts, CA
  • Average humidity in December: 72%

The month with the highest relative humidity is August (79%).
The month with the lowest relative humidity is November (70%).

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Average rainfall in December
Posts, CA

Average rainfall in December - Posts, CA
  • Average rainfall in December: 2.48"

The wettest month (with the highest rainfall) is December (2.48").
The driest month (with the least rainfall) is August (0.04").

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Average rainfall days in December
Posts, CA

Average rainfall days in December - Posts, CA
  • Average rainfall days in December: 9.8 days

The month with the highest number of rainy days is March (12.3 days).
The month with the least rainy days is August (1.3 days).

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

Average daylight in December / Average sunshine in December - Posts, CA
  • Average daylight in December: 9.7h

The month with the longest days is June (Average daylight: 14.6h).
The month with the shortest days is December (Average daylight: 9.7h).

  • Average sunshine in December: 5.9h

The month with the most sunshine is July (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 5.9h).

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Average sunshine days in December
Posts, CA

Average sunshine days in December - Posts, CA
  • Average sunshine days in December: 20.3 days

The month with the most sunshine days is August (27.8 days).
The month with the least sunshine days is March (17.3 days).

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Average UV index in December
Posts, CA

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

Months with the highest UV index are June, July, August and September (UV index 5).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in December
Posts, CA

Average cloud cover in December - Posts, 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 13).

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Average visibility in December
Posts, CA

Average visibility in December - Posts, 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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