December weather forecast
Nicasio, CA

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Weather in December

December, the first month of the winter in Nicasio, is still a cool month, with an average temperature varying between 55.2°F (12.9°C) and 43.9°F (6.6°C).

Temperature

December, known for its average high temperature of 55.2°F (12.9°C) and an average low temperature of 43.9°F (6.6°C), is the coldest month.

Humidity

In December, the average relative humidity is 74%.

Rainfall

In Nicasio, in December, it is raining for 9.5 days, with typically 1.22" (31mm) of accumulated precipitation. In Nicasio, during the entire year, the rain falls for 68.4 days and collects up to 7.28" (185mm) of precipitation.

Daylight

With an average of 9h and 36min of daylight, December has the shortest days of the year in Nicasio.
On the first day of December in Nicasio, sunrise is at 7:08 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:26 am and sunset at 5:01 pm PST.

Sunshine

The month with the least sunshine in Nicasio, California, is December, 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. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In December, a daily maximum UV index of 3 leads to the following instructions:
Act with care - The need to guard against sun damage is communicated. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
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Frequently asked questions

What is the coldest month in Nicasio?

Nicasio's coldest weather arrives in December, when temperatures average a high of 55.2°F (12.9°C) and a low of 43.9°F (6.6°C).

What are the temperatures in Nicasio in December?

In Nicasio, 55.2°F (12.9°C) is the average high-temperature and 43.9°F (6.6°C) is the average low-temperature during December.

What is the average humidity in December in Nicasio?

The average relative humidity in December is 74%.

How many days does it rain in December in Nicasio?

In Nicasio, in December, during 9.5 rainfall days, 1.22" (31mm) of precipitation is typically accumulated.

What is the month with the shortest days in Nicasio?

December has the shortest days of the year in Nicasio, with an average of 9h and 36min of daylight.

How many hours of daylight does Nicasio have in December?

The average day length in December in Nicasio, California, is 9h and 34min.

When is the sunrise / sunset in December in Nicasio?

In December, on the first day of the month, sunrise is at 7:08 am and sunset at 4:51 pm. On the last day of the month, in Nicasio, California, sunrise is at 7:26 am and sunset at 5:01 pm PST.

What is the month with the least sunshine in Nicasio?

The month with the least sunshine in Nicasio, California, is December, with an average of 5.6h of sunshine.

How long on average sun shines in December in Nicasio?

In Nicasio, the average sunshine duration in December is 5.6h.

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

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 reading in December in Nicasio?

The average daily maximum UV index in December in Nicasio, California, is 3. A UV Index estimate of 3 to 5 represents a moderate health threat 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
Nicasio, CA

Average temperature in December - Nicasio, CA
  • Average high temperature in December: 55.2°F

The warmest month (with the highest average high temperature) is September (75.4°F).
The month with the lowest average high temperature is December (55.2°F).

  • Average low temperature in December: 43.9°F

The month with the highest average low temperature is September (55.8°F).
The coldest month (with the lowest average low temperature) is December (43.9°F).

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Average pressure in December
Nicasio, CA

Average pressure in December - Nicasio, 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).

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Average wind speed in December
Nicasio, CA

Average wind speed in December - Nicasio, CA
  • Average wind speed in December: 5.7mph

The windiest month (with the highest average wind speed) is May (7.3mph).
The calmest month (with the lowest average wind speed) is November (5.1mph).

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Average humidity in December
Nicasio, CA

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

The month with the highest relative humidity is March (77%).
The month with the lowest relative humidity is October (66%).

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Average rainfall in December
Nicasio, CA

Average rainfall in December - Nicasio, CA
  • Average rainfall in December: 1.22"

The wettest month (with the highest rainfall) is February (1.65").
The driest months (with the least rainfall) are July, August and September (0.08").

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Average rainfall days in December
Nicasio, CA

Average rainfall days in December - Nicasio, CA
  • Average rainfall days in December: 9.5 days

The month with the highest number of rainy days is March (10.5 days).
The month with the least rainy days is June (2 days).

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

Average daylight in December / Average sunshine in December - Nicasio, CA
  • Average daylight in December: 9h and 4min

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 36min).

  • Average sunshine in December: 5h and 4min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is December (Average sunshine: 5h and 36min).

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Average sunshine days in December
Nicasio, CA

Average sunshine days in December - Nicasio, CA
  • Average sunshine days in December: 20.6 days

The month with the most sunshine days is October (24.9 days).
The month with the least sunshine days is March (18.5 days).

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Average UV index in December
Nicasio, CA

Average UV index in December - Nicasio, 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
Nicasio, CA

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

The month with the most cloud cover is March (Cloud cover 38).
The months with the least cloud cover are July and September (Cloud cover 14).

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Average visibility in December
Nicasio, CA

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

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