December weather forecast and climate
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
December, the first month of the winter, in Jackson, is still a freezing cold month, with temperature in the range of an average high of 28.2°F (-2.1°C) and an average low of 5.9°F (-14.5°C).

Temperature

The coldest months are January and December, with an average high-temperature of 28.2°F (-2.1°C).

Rainfall

In Jackson, it is raining for 10.8 days, with typically 1.5" (37.1mm) of accumulated precipitation. Throughout the year, there are 108.5 rainfall days, and 16.8" (426.2mm) of precipitation is accumulated.

Snowfall

January through June, September through December are months with snowfall. The month with the most snowfall is December when snow falls for 9.5 days and typically aggregates up to 18.6" (472.4mm) of snow.

Daylight

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

Sunshine

The month with the least sunshine is December, with an average of 4h of sunshine.

UV index

The month with the lowest UV index in Jackson is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from the exposure to the Sun's UV rays for the ordinary person.
The average daily UV index of 1 in December transform into the following instructions:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the coldest month in Jackson?

The coldest months in Jackson, Wyoming, are January and December, with an average high-temperature of 28.2°F (-2.1°C).

What is the temperature in December in Jackson?

The average high-temperature, in December, is 28.2°F (-2.1°C), while the average low-temperature is 5.9°F (-14.5°C).

How much does it rain in Jackson in December?

In Jackson, Wyoming, in December, during 10.8 rainfall days, 1.5" (37.1mm) of precipitation is typically accumulated.

How much does it snow in Jackson in December?

In Jackson, Wyoming, in December, snow falls for 9.5 days, with typically accumulated 18.6" (472.4mm) of snow.

When does it snow the most in Jackson?

December is the month with the most snowfall in Jackson, Wyoming. Snow falls for 9.5 days and accumulates 18.6" (472.4mm) of snow.

What is the month with the shortest days in Jackson?

With an average of 9h of daylight, December has the shortest days of the year in Jackson, Wyoming.

How many hours of daylight does Jackson have in December?

The average length of the day in December in Jackson, Wyoming, is 9h.

What is the month with the least sunshine in Jackson?

The month with the least sunshine in Jackson is December, with an average of 4h of sunshine.

How long on average sun shines in December in Jackson?

In Jackson, Wyoming, the average sunshine in December is 4h.

When is the lowest UV index in Jackson?

The month with the lowest UV index in Jackson is December, with an average maximum UV index of 1.

What is the UV index reading in December in Jackson?

In December, the average daily maximum UV index in Jackson, Wyoming, is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to the UV radiation.
Average temperature in December - Jackson, WY
  • Average high temperature in December: 28.2°F

The warmest month (with the highest average high temperature) is July (81.9°F).
Months with the lowest average high temperature are January and December (28.2°F).

  • Average low temperature in December: 5.9°F

The month with the highest average low temperature is July (40.9°F).
The coldest month (with the lowest average low temperature) is January (5°F).

Average rainfall in December - Jackson, WY
  • Average rainfall in December: 1.5"

The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the lowest rainfall) is February (1.1").

Average rainfall days in December - Jackson, WY
  • Average rainfall days in December: 10.8 days

The month with the highest number of rainy days is January (11.3 days).
The month with the lowest number of rainy days is July (7.5 days).

Average snowfall in December - Jackson, WY
  • Average snowfall in December: 18.6"

The month with the highest snowfall is December (18.6").
Months with the lowest snowfall are July and August (0").

Average snowfall days in December - Jackson, WY
  • Average snowfall days in December: 9.5 days

The month with the highest number of snowfall days is January (9.6 days).
Months with the lowest number of snowfall days are July, August and September (0 days).

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

The month with the longest days is June (Average daylight: 15.4h).
The month with shortest days is December (Average daylight: 9h).

  • Average sunshine in December: 4h

Months with most sunshine are June and July (Average sunshine: 11h).
The month with least sunshine is December (Average sunshine: 4h).

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

The month with the highest UV index is July (UV index 10).
The month with the lowest UV index is December (UV index 1).

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