December weather forecast
Cotati, CA

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Weather in December

December, the first month of the winter in Cotati, is still a mild month, with an average temperature fluctuating between 42.4°F (5.8°C) and 55.6°F (13.1°C).

Temperature

Cotati's coldest temperatures are experienced in December, with average high temperatures of 55.6°F (13.1°C) and lows of 42.4°F (5.8°C).

Humidity

In Cotati, the average relative humidity in December is 74%.

Rainfall

In Cotati, in December, it is raining for 6.4 days, with typically 0.67" (17mm) of accumulated precipitation. In Cotati, during the entire year, the rain falls for 44.3 days and collects up to 3.78" (96mm) of precipitation.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:09 am and sunset at 4:50 pm. On the last day of December, in Cotati, sunrise is at 7:27 am and sunset at 5:00 pm PST.

Sunshine

The month with the least sunshine 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. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index, 3 during December, leads to the following recommendations:
Prioritize safety - Recommendations to avert sunburn are shared. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Updated: Aug 10, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months?

The coldest month is December, with an average high-temperature of 55.6°F (13.1°C) and an average low-temperature of 42.4°F (5.8°C).

What is the usual temperature for Cotati in December?

In December, in Cotati, the average high-temperature is 55.6°F (13.1°C), and the average low-temperature is 42.4°F (5.8°C).

What is the average humidity in December?

In December, the average relative humidity is 74%.

How much does it rain in December?

In Cotati, California, in December, during 6.4 rainfall days, 0.67" (17mm) of precipitation is typically accumulated.

What is the month with the shortest days in Cotati?

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

How many hours of daylight does Cotati have in December?

The average day length in December in Cotati is 9h and 33min.

When are sunrise and sunset in December in Cotati?

In December, on the first day of the month, sunrise is at 7:09 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:27 am and sunset at 5:00 pm PST.

What is the month with the least sunshine?

The month with the least sunshine is December, with an average of 5.7h of sunshine.

How long on average sun shines in December?

In December, the average sunshine duration is 5.7h.

When is the lowest UV index?

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

What is the UV index reading in December?

In Cotati, the average daily maximum UV index in December is 3. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Cotati, CA

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

The warmest months (with the highest average high temperature) are July and August (79.9°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in December: 42.4°F

The months with the highest average low temperature are August and September (55°F).
The coldest month (with the lowest average low temperature) is December (42.4°F).

Average pressure in December
Cotati, CA

Average pressure in December - Cotati, CA
  • Average pressure in December: 30.11"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).

Average wind speed in December
Cotati, CA

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

The windiest month (with the highest average wind speed) is May (6.8mph).
The calmest month (with the lowest average wind speed) is November (4.7mph).

Average humidity in December
Cotati, CA

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

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is September (62%).

Average rainfall in December
Cotati, CA

Average rainfall in December - Cotati, CA
  • Average rainfall in December: 0.67"

The wettest month (with the highest rainfall) is February (0.91").
The driest months (with the least rainfall) are June, July, August and September (0.04").

Average rainfall days in December
Cotati, CA

Average rainfall days in December - Cotati, CA
  • Average rainfall days in December: 6.4 days

The month with the highest number of rainy days is March (8.7 days).
The month with the least rainy days is August (0.5 days).

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

Average daylight in December / Average sunshine in December - Cotati, 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).

Average sunshine days in December
Cotati, CA

Average sunshine days in December - Cotati, CA
  • Average sunshine days in December: 22.5 days

The month with the most sunshine days is June (27.7 days).
The month with the least sunshine days is March (20.8 days).

Average UV index in December
Cotati, CA

Average UV index in December - Cotati, 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).

Average cloud cover in December
Cotati, CA

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

The month with the most cloud cover is March (Cloud cover 38).
The month with the least cloud cover is July (Cloud cover 9).

Average visibility in December
Cotati, CA

Average visibility in December - Cotati, 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).

Cotati, California, USA

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