December weather forecast
Yellowstone National Park, WY

The natural Grand Prismatic hot springs within Yellowstone National Park, Wyoming, with yellow trails and trees and mountains in the background
The natural Grand Prismatic hot springs within Yellowstone National Park, Wyoming, with yellow trails and trees and mountains in the background

Weather in December

December, the first month of the winter in Yellowstone National Park, is still a freezing cold month, with temperature in the range of an average low of 5°F (-15°C) and an average high of 24.3°F (-4.3°C).

Temperature

December is the coldest month, with an average high-temperature of 24.3°F (-4.3°C) and an average low-temperature of 5°F (-15°C).

Rainfall

In Yellowstone National Park, in December, it is raining for 15.6 days, with typically 1.63" (41.4mm) of accumulated precipitation. Throughout the year, in Yellowstone National Park, there are 151 rainfall days, and 20.9" (530.8mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through June, September through December. In Yellowstone National Park, Wyoming, in December, snow falls for 14.9 days, with typically accumulated 30.5" (774.7mm) of snow. In Yellowstone National Park, during the entire year, snow falls for 91.4 days and aggregates up to 193.7" (4920mm) of snow.

Daylight

The month with the shortest days is December, with an average of 8h and 55min of daylight.
On the first day of the month, sunrise is at 7:38 am and sunset at 4:44 pm. On the last day of December, sunrise is at 7:58 am and sunset at 4:52 pm MST.

Sunshine

With an average of 4h of sunshine, December has the least sunshine of the year.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Yellowstone National Park, Wyoming. A UV Index estimate of 2, and below, represents a low health risk 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:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. 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. 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 Yellowstone National Park?

With an average high-temperature of 24.3°F (-4.3°C) and an average low-temperature of 5°F (-15°C), December is the coldest month in Yellowstone National Park.

How much does it rain in Yellowstone National Park in December?

In Yellowstone National Park, Wyoming, in December, it is raining for 15.6 days, with typically 1.63" (41.4mm) of accumulated precipitation.

How much does it snow in Yellowstone National Park in December?

In Yellowstone National Park, in December, during 14.9 snowfall days, 30.5" (774.7mm) of snow is typically accumulated.

What is the month with the shortest days in Yellowstone National Park?

With an average of 8h and 55min of daylight, December has the shortest days of the year in Yellowstone National Park, Wyoming.

How many hours of daylight does Yellowstone National Park have in December?

In December, the average day length is 8h and 55min.

When are sunrise and sunset in December in Yellowstone National Park?

On the first day of December, sunrise is at 7:38 am and sunset at 4:44 pm. On the last day of the month, sunrise is at 7:58 am and sunset at 4:52 pm MST.

What is the month with the least sunshine in Yellowstone National Park?

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

How long on average sun shines in December in Yellowstone National Park?

In Yellowstone National Park, the average sunshine duration in December is 4h.

What are the months with the lowest UV index in Yellowstone National Park?

The months with the lowest UV index in Yellowstone National Park are January and December, with an average maximum UV index of 1.

How high is the UV index in December in Yellowstone National Park?

The average daily maximum UV index in December in Yellowstone National Park is 1. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to UV radiation.
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average UV index

Average temperature in December
Yellowstone National Park, WY

Average temperature in December - Yellowstone National Park, WY
  • Average high temperature in December: 24.3°F

The warmest month (with the highest average high temperature) is July (71.6°F).
The month with the lowest average high temperature is December (24.3°F).

  • Average low temperature in December: 5°F

The month with the highest average low temperature is July (41.6°F).
The coldest months (with the lowest average low temperature) are January and February (1.2°F).

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Average rainfall in December
Yellowstone National Park, WY

Average rainfall in December - Yellowstone National Park, WY
  • Average rainfall in December: 1.6"

The wettest month (with the highest rainfall) is May (2.5").
The driest month (with the least rainfall) is October (1.2").

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Average rainfall days in December
Yellowstone National Park, WY

Average rainfall days in December - Yellowstone National Park, WY
  • Average rainfall days in December: 15.6 days

The month with the highest number of rainy days is January (16.8 days).
The month with the least rainy days is October (8.8 days).

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Average snowfall in December
Yellowstone National Park, WY

Average snowfall in December - Yellowstone National Park, WY
  • Average snowfall in December: 30.5"

The month with the highest snowfall is January (34.3").
The months with the least snowfall are July and August (0").

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Average snowfall days in December
Yellowstone National Park, WY

Average snowfall days in December - Yellowstone National Park, WY
  • Average snowfall days in December: 14.9 days

The month with the highest number of snowfall days is January (16.2 days).
The months with the least snowfall days are July and August (0 days).

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Average daylight in December /
Average sunshine in December
Yellowstone National Park, WY

Average daylight in December / Average sunshine in December - Yellowstone National Park, WY
  • Average daylight in December: 8h and 55min

The month with the longest days is June (Average daylight: 15h and 29min).
The month with the shortest days is December (Average daylight: 8h and 55min).

  • Average sunshine in December: 4h

The month with the most sunshine is July (Average sunshine: 11h).
The month with the least sunshine is December (Average sunshine: 4h).

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Average UV index in December
Yellowstone National Park, WY

Average UV index in December - Yellowstone National Park, WY
  • Average UV index in December: 1

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

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