December weather forecast
Jackson, WY

A calm and clear river and vast green fields approaching the iconic white mountains within the Grand Teton National Park in Jackson, Wyoming
A calm and clear river and vast green fields approaching the iconic white mountains within the Grand Teton National Park in Jackson, Wyoming

Weather in December

The first month of the winter, December, is still a freezing cold month in Jackson, Wyoming, with temperature in the range of an average high of 21.9°F (-5.6°C) and an average low of 5.2°F (-14.9°C).

Temperature

With an average high-temperature of 21.9°F (-5.6°C) and an average low-temperature of 5.2°F (-14.9°C), December is the coldest month.

Humidity

In Jackson, Wyoming, the average relative humidity in December is 92%.

Rainfall

In Jackson, in December, it is raining for 4.2 days, with typically 2.91" (74mm) of accumulated precipitation. In Jackson, during the entire year, the rain falls for 103 days and collects up to 29.84" (758mm) of precipitation.

Snowfall

January through December are months with snowfall. In Jackson, Wyoming, during December, snow falls for 23.7 days and regularly aggregates up to 24.72" (628mm) of snow. In Jackson, during the entire year, snow falls for 173.6 days and aggregates up to 181.26" (4604mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 1min of daylight.
On the first day of the month, sunrise is at 7:36 am and sunset at 4:48 pm. On the last day of December, in Jackson, sunrise is at 7:55 am and sunset at 4:56 pm MST.

Sunshine

The average sunshine in December is 3.6h.

UV index

January through April, October through December, with an average maximum UV index of 1, are months with the lowest UV index in Jackson. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Jackson?

December is the coldest month, with an average high-temperature of 21.9°F (-5.6°C) and an average low-temperature of 5.2°F (-14.9°C).

What is the average humidity in December in Jackson?

In Jackson, Wyoming, the average relative humidity in December is 92%.

How many days does it rain in December in Jackson?

In Jackson, Wyoming, in December, it is raining for 4.2 days, with typically 2.91" (74mm) of accumulated precipitation.

How much does it snow in Jackson in December?

In Jackson, Wyoming, in December, during 23.7 snowfall days, 24.72" (628mm) of snow is typically accumulated.

What is the month with the shortest days in Jackson?

December has the shortest days of the year in Jackson, with an average of 9h and 1min of daylight.

How many hours of daylight does Jackson have in December?

In Jackson, the average day length in December is 9h and 1min.

When is the sunrise / sunset in December in Jackson?

In December, on the first day of the month, sunrise is at 7:36 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 4:56 pm MST.

How many hours of sunshine does Jackson have in December?

In Jackson, the average sunshine duration in December is 3.6h.

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

January through April, October through December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index intensity in December in Jackson?

In Jackson, Wyoming, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes a low health risk from 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, WY

Average temperature in December - Jackson, WY
  • Average high temperature in December: 21.9°F

The warmest month (with the highest average high temperature) is July (73.4°F).
The month with the lowest average high temperature is December (21.9°F).

  • Average low temperature in December: 5.2°F

The month with the highest average low temperature is July (43.5°F).
The coldest month (with the lowest average low temperature) is January (4.8°F).

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Average pressure in December
Jackson, WY

Average pressure in December - Jackson, WY
  • Average pressure in December: 30.25"Hg

The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in December
Jackson, WY

Average wind speed in December - Jackson, WY
  • Average wind speed in December: 4.3mph

The windiest month (with the highest average wind speed) is June (5.7mph).
The calmest month (with the lowest average wind speed) is December (4.3mph).

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Average humidity in December
Jackson, WY

Average humidity in December - Jackson, WY
  • Average humidity in December: 92%

The month with the highest relative humidity is February (94%).
The month with the lowest relative humidity is August (50%).

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Average rainfall in December
Jackson, WY

Average rainfall in December - Jackson, WY
  • Average rainfall in December: 2.91"

The wettest month (with the highest rainfall) is February (3.54").
The driest month (with the least rainfall) is August (1.34").

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Average rainfall days in December
Jackson, WY

Average rainfall days in December - Jackson, WY
  • Average rainfall days in December: 4.2 days

The month with the highest number of rainy days is May (15.4 days).
The month with the least rainy days is January (2.9 days).

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Average snowfall in December
Jackson, WY

Average snowfall in December - Jackson, WY
  • Average snowfall in December: 24.72"

The month with the highest snowfall is February (29.33").
The month with the least snowfall is August (0.12").

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Average snowfall days in December
Jackson, WY

Average snowfall days in December - Jackson, WY
  • Average snowfall days in December: 23.7 days

The month with the highest number of snowfall days is March (24.8 days).
The month with the least snowfall days is July (0.4 days).

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

Average daylight in December / Average sunshine in December - Jackson, WY
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 22min).
The month with the shortest days is December (Average daylight: 9h and 1min).

  • Average sunshine in December: 3h and 36min

The month with the most sunshine is July (Average sunshine: 11h and 36min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).

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Average sunshine days in December
Jackson, WY

Average sunshine days in December - Jackson, WY
  • Average sunshine days in December: 8 days

The month with the most sunshine days is July (15.6 days).
The month with the least sunshine days is April (3.8 days).

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Average UV index in December
Jackson, WY

Average UV index in December - Jackson, WY
  • Average UV index in December: 1

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).

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Average cloud cover in December
Jackson, WY

Average cloud cover in December - Jackson, WY
  • Average cloud cover in December: 66

The month with the most cloud cover is February (Cloud cover 72).
The months with the least cloud cover are July and August (Cloud cover 16).

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Average visibility in December
Jackson, WY

Average visibility in December - Jackson, WY
  • Average visibility in December: 3mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).

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