December weather forecast
Jackson, WY

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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

December in Jackson witnesses the return of the harsh winter. The mercury continues its descend, dancing around a chilling 5.2°F (-14.9°C) to 21.9°F (-5.6°C). Substantial snowfall of 24.72" (628mm) buries the city under a thick layer of white. The city basks under short daylight hours, with the landscape often hidden behind the cloak of snowfall. As December concludes, it leaves behind footprints of a challenging but enchantingly beautiful winter.

Temperature

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

Humidity

In Jackson, 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. Throughout the year, there are 103 rainfall days, and 29.84" (758mm) of precipitation is accumulated.

Snowfall

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

Daylight

December has the shortest days of the year, with an average of 9h and 0min of daylight.
On the first day of December, sunrise is at 7:36 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:55 am and sunset at 4:56 pm MST.

Sunshine

In December, the average sunshine 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. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 1 during December translates into the following guidance:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the coldest time of year?

December brings the lowest temperatures in Jackson, with an average high of 21.9°F (-5.6°C) and an average low of 5.2°F (-14.9°C).

How cold is it in December?

The high-temperature, in December, in Jackson, records 21.9°F (-5.6°C), while the low-temperature is 5.2°F (-14.9°C).

What is the average humidity in December?

The average relative humidity in December is 92%.

How many days does it rain in December?

In December, the rain falls for 4.2 days. Throughout December, 2.91" (74mm) of precipitation is accumulated.

How many days does it snow in December?

In Jackson, 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?

With an average of 9h and 0min of daylight, December has the shortest days of the year.

How many hours of daylight does Jackson have in December?

The average day length in December is 9h and 1min.

What time are sunrise and sunset in December?

On the first day of December in Jackson, sunrise is at 7:36 am and sunset at 4:47 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.

When is the lowest UV index?

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

How high is the UV index in December?

In Jackson, the average daily maximum UV index in December is 1. A UV Index 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).

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).

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).

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%).

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").

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).

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").

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).

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 0min

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).

  • Average sunshine in December: 3h and 4min

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).

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).

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).

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).

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).

Jackson, Wyoming, USA

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