December weather forecast
Windsor, CA

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Weather in December

The first month of the winter, December, is still a mild month in Windsor, California, with an average temperature fluctuating between 40.5°F (4.7°C) and 55.8°F (13.2°C).

Temperature

In Windsor, December records the lowest average temperatures, peaking at 55.8°F (13.2°C) and reaching a low of 40.5°F (4.7°C).

Humidity

The average relative humidity in December in Windsor is 74%.

Rainfall

In Windsor, during December, the rain falls for 11.6 days and regularly aggregates up to 3.27" (83mm) of precipitation. Throughout the year, there are 80.5 rainfall days, and 17.6" (447mm) of precipitation is accumulated.

Daylight

December has the shortest days of the year in Windsor, 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 5:00 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 5.6h 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 Windsor. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: In December, the maximum UV index of 3 suggests these recommendations:
Ensure safety - Imperative it is to shield skin and eyes from damage. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
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Frequently asked questions

What part of the year is the coldest in Windsor?

With average high and low temperatures of 55.8°F (13.2°C) and 40.5°F (4.7°C) respectively, December is Windsor's coldest month.

What is the temperature in December in Windsor?

The high-temperature, in December, in Windsor, records 55.8°F (13.2°C), while the low-temperature is 40.5°F (4.7°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, in September is appraised at 84.2°F (29°C).

What is the average humidity in December in Windsor?

In December, the average relative humidity is 74%.

How much does it rain in Windsor in December?

In Windsor, California, in December, it is raining for 11.6 days, with typically 3.27" (83mm) of accumulated precipitation.

What is the month with the shortest days in Windsor?

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

How many hours of daylight does Windsor have in December?

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

When is the sunrise / sunset in December in Windsor?

On the first day of December, 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 5:00 pm PST.

What is the month with the least sunshine in Windsor?

December has the least sunshine of the year in Windsor, with an average of 5.6h of sunshine.

How long on average sun shines in December in Windsor?

The average sunshine duration in December in Windsor, California, is 5.6h.

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

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

What is the UV index intensity in December in Windsor?

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

Average temperature in December - Windsor, CA
  • Average high temperature in December: 55.8°F

The warmest month (with the highest average high temperature) is August (83.5°F).
The month with the lowest average high temperature is December (55.8°F).

  • Average low temperature in December: 40.5°F

The month with the highest average low temperature is August (54.3°F).
The coldest month (with the lowest average low temperature) is December (40.5°F).

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Average pressure in December
Windsor, CA

Average pressure in December - Windsor, 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
Windsor, CA

Average wind speed in December - Windsor, CA
  • Average wind speed in December: 4.8mph

The windiest month (with the highest average wind speed) is May (6.4mph).
The calmest month (with the lowest average wind speed) is November (4.5mph).

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Average humidity in December
Windsor, CA

Average humidity in December - Windsor, CA
  • Average humidity in December: 74%

The month with the highest relative humidity is March (76%).
The month with the lowest relative humidity is September (58%).

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Average rainfall in December
Windsor, CA

Average rainfall in December - Windsor, CA
  • Average rainfall in December: 3.27"

The wettest month (with the highest rainfall) is February (3.78").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Windsor, CA

Average rainfall days in December - Windsor, CA
  • Average rainfall days in December: 11.6 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 days).

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

Average daylight in December / Average sunshine in December - Windsor, 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: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

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Average sunshine days in December
Windsor, CA

Average sunshine days in December - Windsor, 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 (15.3 days).

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Average UV index in December
Windsor, CA

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

The months with the highest UV index are June, July and August (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
Windsor, CA

Average cloud cover in December - Windsor, CA
  • Average cloud cover in December: 38

The month with the most cloud cover is March (Cloud cover 41).
The month with the least cloud cover is July (Cloud cover 8).

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Average visibility in December
Windsor, CA

Average visibility in December - Windsor, 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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Windsor, California, USA

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