December weather forecast
Jackson, CA

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Weather in December

December, the first month of the winter in Jackson, is also a fresh month, with an average temperature fluctuating between 37.9°F (3.3°C) and 52.9°F (11.6°C).

Temperature

December is Jackson's coldest month, registering average high temperatures of 52.9°F (11.6°C) and lows of 37.9°F (3.3°C).

Humidity

The average relative humidity in December is 68%.

Rainfall

In Jackson, California, during December, the rain falls for 11 days and regularly aggregates up to 4.02" (102mm) of precipitation. Throughout the year, there are 81.8 rainfall days, and 23.39" (594mm) of precipitation is accumulated.

Snowfall

February, March, November and December are months with snowfall. December is the last month it regularly snows. During 0.3 snowfall days, in December, Jackson aggregates 0.63" (16mm) of snow. Throughout the year, there are 2.8 snowfall days, and 4.65" (118mm) of snow is accumulated.

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 7:01 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:52 pm PST.

Sunshine

The month with the least sunshine in Jackson, California, is December, with an average of 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 value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 3 in December translates into the following recommendations:
Act with care - Obligation to protect against skin and eye damage is highlighted. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Stay sun-safe with clothing that is both closely woven and worn loosely. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Updated: Jun 20, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

In Jackson, the average lowest temperatures are observed in December, with a high of 52.9°F (11.6°C) and a low of 37.9°F (3.3°C).

What is the usual temperature for Jackson in December?

The average high-temperature and low-temperature during December are 52.9°F (11.6°C) and 37.9°F (3.3°C) respectively. The average heat index (a.k.a. 'feels like', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in September is calculated to be 84.2°F (29°C).

What is the average humidity in December?

The average relative humidity in December in Jackson is 68%.

How much does it rain in December?

In Jackson, in December, during 11 rainfall days, 4.02" (102mm) of precipitation is typically accumulated.

What is the last month it snows?

December is the last month it regularly snows. During 0.3 snowfall days, in December, Jackson aggregates 0.63" (16mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 30min of daylight.

What is the average length of the day in December?

In Jackson, the average day length in December is 9h and 33min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:52 pm PST.

What is the month with the least sunshine?

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

How long on average sun shines in December?

The average sunshine duration in December is 6h.

What is the month with the lowest UV index?

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

How high is the UV index in December?

The average daily maximum UV index in December is 3. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
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
Jackson, CA

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

The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is December (52.9°F).

  • Average low temperature in December: 37.9°F

The month with the highest average low temperature is July (59°F).
The coldest month (with the lowest average low temperature) is December (37.9°F).

Average pressure in December
Jackson, CA

Average pressure in December - Jackson, 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).

Average wind speed in December
Jackson, CA

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

The windiest month (with the highest average wind speed) is February (5.7mph).
The calmest month (with the lowest average wind speed) is August (3.8mph).

Average humidity in December
Jackson, CA

Average humidity in December - Jackson, CA
  • Average humidity in December: 68%

The month with the highest relative humidity is March (74%).
The month with the lowest relative humidity is July (40%).

Average rainfall in December
Jackson, CA

Average rainfall in December - Jackson, CA
  • Average rainfall in December: 4.02"

The wettest month (with the highest rainfall) is March (4.69").
The driest months (with the least rainfall) are July and August (0.04").

Average rainfall days in December
Jackson, CA

Average rainfall days in December - Jackson, CA
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is March (14.6 days).
The month with the least rainy days is August (1.5 days).

Average snowfall in December
Jackson, CA

Average snowfall in December - Jackson, CA
  • Average snowfall in December: 0.63"

The month with the highest snowfall is February (2.01").
The months with the least snowfall are January, April, May, June, July, August, September and October (0").

Average snowfall days in December
Jackson, CA

Average snowfall days in December - Jackson, CA
  • Average snowfall days in December: 0.3 days

The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Jackson, 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: 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).

Average sunshine days in December
Jackson, CA

Average sunshine days in December - Jackson, CA
  • Average sunshine days in December: 18.6 days

The month with the most sunshine days is August (28.8 days).
The month with the least sunshine days is March (15.1 days).

Average UV index in December
Jackson, CA

Average UV index in December - Jackson, 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).

Average cloud cover in December
Jackson, CA

Average cloud cover in December - Jackson, CA
  • Average cloud cover in December: 33

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is July (Cloud cover 4).

Average visibility in December
Jackson, CA

Average visibility in December - Jackson, 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).

Jackson, California, USA

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