December weather forecast
Sebastopol, CA

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Weather in December

December, the first month of the winter in Sebastopol, is also a moderate month, with an average temperature fluctuating between 55.6°F (13.1°C) and 41.9°F (5.5°C).

Temperature

Sebastopol's temperature records reveal December as the coldest month, marked by average highs of 55.6°F (13.1°C) and lows of 41.9°F (5.5°C).

Humidity

The average relative humidity in December is 75%.

Rainfall

In Sebastopol, in December, during 10.5 rainfall days, 2.24" (57mm) of precipitation is typically accumulated. Throughout the year, there are 72.8 rainfall days, and 12.01" (305mm) of precipitation is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:10 am and sunset at 4:50 pm. On the last day of December, sunrise is at 7:28 am and sunset at 5:01 pm PST.

Sunshine

The month with the least sunshine in Sebastopol is December, with an average of 5.7h 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 Sebastopol. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the maximum UV index of 3 transforms into these recommendations:
Guard yourself - Avoiding sunburn is suggested. The solar radiation around mid-day is intense; avoid the Sun and stay safe. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
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Frequently asked questions

What part of the year is the coldest in Sebastopol?

Sebastopol's December weather, marked by an average high temperature of 55.6°F (13.1°C) and an average low temperature of 41.9°F (5.5°C), is the coldest in the year.

What is the average December temperature in Sebastopol?

The average high-temperature and low-temperature in Sebastopol during December are 55.6°F (13.1°C) and 41.9°F (5.5°C) respectively.

What is the average humidity in December in Sebastopol?

In December, the average relative humidity in Sebastopol is 75%.

How many days does it rain in December in Sebastopol?

In Sebastopol, California, in December, during 10.5 rainfall days, 2.24" (57mm) of precipitation is typically accumulated.

What is the month with the shortest days in Sebastopol?

December has the shortest days of the year in Sebastopol, with an average of 9h and 30min of daylight.

How many hours of daylight does Sebastopol have in December?

In Sebastopol, the average day length in December is 9h and 32min.

What time are sunrise and sunset in December in Sebastopol?

On the first day of December in Sebastopol, sunrise is at 7:10 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 5:01 pm PST.

What is the month with the least sunshine in Sebastopol?

December has the least sunshine of the year in Sebastopol, California, with an average of 5.7h of sunshine.

How long on average sun shines in December in Sebastopol?

In Sebastopol, the average sunshine duration in December is 5.7h.

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

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

What is the UV index intensity in December in Sebastopol?

In December, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Sebastopol, CA

Average temperature in December - Sebastopol, CA
  • Average high temperature in December: 55.6°F

The warmest month (with the highest average high temperature) is August (79.7°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in December: 41.9°F

The months with the highest average low temperature are August and September (54.7°F).
The coldest month (with the lowest average low temperature) is December (41.9°F).

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Average pressure in December
Sebastopol, CA

Average pressure in December - Sebastopol, CA
  • Average pressure in December: 30.1"Hg

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

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Average wind speed in December
Sebastopol, CA

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

The windiest month (with the highest average wind speed) is May (7.1mph).
The calmest month (with the lowest average wind speed) is November (4.9mph).

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Average humidity in December
Sebastopol, CA

Average humidity in December - Sebastopol, CA
  • Average humidity in December: 75%

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (63%).

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Average rainfall in December
Sebastopol, CA

Average rainfall in December - Sebastopol, CA
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is February (2.64").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Sebastopol, CA

Average rainfall days in December - Sebastopol, CA
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is March (12.6 days).
The month with the least rainy days is August (0.8 days).

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

Average daylight in December / Average sunshine in December - Sebastopol, CA
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 42min).

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Average sunshine days in December
Sebastopol, CA

Average sunshine days in December - Sebastopol, CA
  • Average sunshine days in December: 19.5 days

The month with the most sunshine days is July (27.2 days).
The month with the least sunshine days is March (17.1 days).

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Average UV index in December
Sebastopol, CA

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

The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 3).

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Average cloud cover in December
Sebastopol, CA

Average cloud cover in December - Sebastopol, CA
  • Average cloud cover in December: 37

The month with the most cloud cover is March (Cloud cover 39).
The month with the least cloud cover is July (Cloud cover 9).

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Average visibility in December
Sebastopol, CA

Average visibility in December - Sebastopol, CA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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Sebastopol, California, USA

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