December weather forecast
Jamestown, CA

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Weather in December

December, the first month of the winter in Jamestown, is also a fresh month, with an average temperature fluctuating between 52.9°F (11.6°C) and 37.2°F (2.9°C).

Temperature

In Jamestown, December is the coldest month, with temperatures averaging a high of 52.9°F (11.6°C) and a low of 37.2°F (2.9°C).

Humidity

In Jamestown, the average relative humidity in December is 66%.

Rainfall

In Jamestown, in December, it is raining for 9.5 days, with typically 3.98" (101mm) of accumulated precipitation. In Jamestown, during the entire year, the rain falls for 76.7 days and collects up to 23.9" (607mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall in Jamestown. In Jamestown, in December, during 0.2 snowfall days, 0.43" (11mm) of snow is typically accumulated. Throughout the year, there are 2.1 snowfall days, and 4.41" (112mm) of snow is accumulated.

Daylight

With an average of 9h and 36min of daylight, December has the shortest days of the year in Jamestown.
On the first day of the month, sunrise is at 6:59 am and sunset at 4:42 pm. On the last day of December, in Jamestown, sunrise is at 7:17 am and sunset at 4:52 pm PST.

Sunshine

December has the least sunshine of the year, with an average of 6h of sunshine.

UV index

In Jamestown, the average daily maximum UV index in December is 3. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: In December, a daily maximum UV index of 3 leads to the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
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Frequently asked questions

What time of the year is the coldest in Jamestown?

The coldest month is December, with an average high-temperature of 52.9°F (11.6°C) and an average low-temperature of 37.2°F (2.9°C).

What is the usual temperature for Jamestown in December?

December temperatures in Jamestown, California, vary between a high-temperature of 52.9°F (11.6°C) and a low-temperature of 37.2°F (2.9°C). The average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, in June is calculated to be 82.4°F (28°C).

What is the average humidity in December in Jamestown?

In Jamestown, the average relative humidity in December is 66%.

How much does it rain in Jamestown in December?

In Jamestown, California, in December, during 9.5 rainfall days, 3.98" (101mm) of precipitation is typically accumulated.

How much does it snow in Jamestown in December?

In Jamestown, California, in December, snow falls for 0.2 days, with typically accumulated 0.43" (11mm) of snow.

What is the month with the shortest days in Jamestown?

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

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

The average day length in December in Jamestown, California, is 9h and 35min.

When are sunrise and sunset in December in Jamestown?

On the first day of December in Jamestown, California, sunrise is at 6:59 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:52 pm PST.

What is the month with the least sunshine in Jamestown?

December has the least sunshine of the year in Jamestown, California, with an average of 6h of sunshine.

How many hours of sunshine does Jamestown have in December?

In December, the average sunshine duration in Jamestown is 6h.

What is the UV index reading in December in Jamestown?

The average daily maximum UV index in December in Jamestown is 3. A UV Index reading of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Jamestown, CA

Average temperature in December - Jamestown, CA
  • Average high temperature in December: 52.9°F

The warmest month (with the highest average high temperature) is July (91.4°F).
The month with the lowest average high temperature is December (52.9°F).

  • Average low temperature in December: 37.2°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is December (37.2°F).

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Average pressure in December
Jamestown, CA

Average pressure in December - Jamestown, CA
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in December
Jamestown, CA

Average wind speed in December - Jamestown, CA
  • Average wind speed in December: 4.7mph

The windiest months (with the highest average wind speed) are February, March and April (5.7mph).
The calmest months (with the lowest average wind speed) are November and December (4.7mph).

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Average humidity in December
Jamestown, CA

Average humidity in December - Jamestown, CA
  • Average humidity in December: 66%

The month with the highest relative humidity is March (70%).
The month with the lowest relative humidity is July (32%).

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Average rainfall in December
Jamestown, CA

Average rainfall in December - Jamestown, CA
  • Average rainfall in December: 3.98"

The wettest month (with the highest rainfall) is March (4.76").
The driest months (with the least rainfall) are July and August (0.04").

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Average rainfall days in December
Jamestown, CA

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

The month with the highest number of rainy days is March (13.4 days).
The month with the least rainy days is August (1.4 days).

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Average snowfall in December
Jamestown, CA

Average snowfall in December - Jamestown, CA
  • Average snowfall in December: 0.43"

The month with the highest snowfall is February (2.72").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Jamestown, CA

Average snowfall days in December - Jamestown, CA
  • Average snowfall days in December: 0.2 days

The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Jamestown, 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: 6h and 0min

The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).

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Average sunshine days in December
Jamestown, CA

Average sunshine days in December - Jamestown, CA
  • Average sunshine days in December: 20.5 days

The months with the most sunshine days are July and August (28.4 days).
The month with the least sunshine days is March (16.8 days).

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Average UV index in December
Jamestown, CA

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

The months with the highest UV index are June and July (UV index 7).
The month with the lowest UV index is November (UV index 2).

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Average cloud cover in December
Jamestown, CA

Average cloud cover in December - Jamestown, CA
  • Average cloud cover in December: 32

The month with the most cloud cover is March (Cloud cover 35).
The months with the least cloud cover are July and August (Cloud cover 5).

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Average visibility in December
Jamestown, CA

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

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