December weather forecast
Cheyenne, WY

A sunny day in front of the State Capitol building in Cheyenne, Wyoming
A sunny day in front of the State Capitol building in Cheyenne, Wyoming

Weather in December

The first month of the winter, December, is also a wintry month in Cheyenne, Wyoming, with an average temperature fluctuating between 20.3°F (-6.5°C) and 34.7°F (1.5°C).

Temperature

December is the coldest month, with an average high-temperature of 34.7°F (1.5°C) and an average low-temperature of 20.3°F (-6.5°C).

Humidity

In December, the average relative humidity in Cheyenne is 63%.

Rainfall

In December, in Cheyenne, the rain falls for 5.5 days. Throughout December, 0.59" (15mm) of precipitation is accumulated. In Cheyenne, during the entire year, the rain falls for 116 days and collects up to 14.57" (370mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Cheyenne. In Cheyenne, snow falls for 9.6 days, with typically accumulated 2.8" (71mm) of snow. Throughout the year, in Cheyenne, there are 62 snowfall days, and 30.51" (775mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Cheyenne, with an average of 9h and 16min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:40 pm MST.

Sunshine

In December, the average sunshine is 6.6h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Cheyenne, Wyoming. A UV Index estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 2 in December transform into the following instructions:
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. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Cheyenne?

The coldest month in Cheyenne, Wyoming, is December, with an average high-temperature of 34.7°F (1.5°C) and an average low-temperature of 20.3°F (-6.5°C).

What is the average humidity in December in Cheyenne?

In Cheyenne, the average relative humidity in December is 63%.

How much does it rain in Cheyenne in December?

In Cheyenne, in December, during 5.5 rainfall days, 0.59" (15mm) of precipitation is typically accumulated.

How many days does it snow in December in Cheyenne?

In Cheyenne, in December, snow falls for 9.6 days, with typically accumulated 2.8" (71mm) of snow.

What is the month with the shortest days in Cheyenne?

The month with the shortest days in Cheyenne is December, with an average of 9h and 16min of daylight.

How many hours of daylight does Cheyenne have in December?

In Cheyenne, the average day length in December is 9h and 16min.

What time are sunrise and sunset in December in Cheyenne?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:31 pm. On the last day of the month, in Cheyenne, Wyoming, sunrise is at 7:24 am and sunset at 4:40 pm MST.

How long on average sun shines in December in Cheyenne?

The average sunshine duration in December in Cheyenne is 6.6h.

When is the lowest UV index in Cheyenne?

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December in Cheyenne?

The average daily maximum UV index in December in Cheyenne is 2. A UV Index reading of 2, and below, represents a minimal hazard to health 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
Cheyenne, WY

Average temperature in December - Cheyenne, WY
  • Average high temperature in December: 34.7°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is December (34.7°F).

  • Average low temperature in December: 20.3°F

The month with the highest average low temperature is July (59.9°F).
The coldest month (with the lowest average low temperature) is December (20.3°F).

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Average pressure in December
Cheyenne, WY

Average pressure in December - Cheyenne, WY
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

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Average wind speed in December
Cheyenne, WY

Average wind speed in December - Cheyenne, WY
  • Average wind speed in December: 13.1mph

The windiest month (with the highest average wind speed) is January (14.2mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).

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Average humidity in December
Cheyenne, WY

Average humidity in December - Cheyenne, WY
  • Average humidity in December: 63%

The month with the highest relative humidity is February (64%).
The month with the lowest relative humidity is August (43%).

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Average rainfall in December
Cheyenne, WY

Average rainfall in December - Cheyenne, WY
  • Average rainfall in December: 0.59"

The wettest month (with the highest rainfall) is May (2.95").
The driest month (with the least rainfall) is January (0.43").

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Average rainfall days in December
Cheyenne, WY

Average rainfall days in December - Cheyenne, WY
  • Average rainfall days in December: 5.5 days

The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is January (4.7 days).

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Average snowfall in December
Cheyenne, WY

Average snowfall in December - Cheyenne, WY
  • Average snowfall in December: 2.8"

The month with the highest snowfall is March (6.06").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Cheyenne, WY

Average snowfall days in December - Cheyenne, WY
  • Average snowfall days in December: 9.6 days

The month with the highest number of snowfall days is February (11.3 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in December / Average sunshine in December - Cheyenne, WY
  • Average daylight in December: 9h and 16min

The month with the longest days is June (Average daylight: 15h and 5min).
The month with the shortest days is December (Average daylight: 9h and 16min).

  • Average sunshine in December: 6h and 36min

The months with the most sunshine are July and August (Average sunshine: 11h and 36min).
The month with the least sunshine is February (Average sunshine: 6h and 30min).

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Average sunshine days in December
Cheyenne, WY

Average sunshine days in December - Cheyenne, WY
  • Average sunshine days in December: 19.5 days

The month with the most sunshine days is January (20.7 days).
The month with the least sunshine days is April (9.3 days).

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Average UV index in December
Cheyenne, WY

Average UV index in December - Cheyenne, WY
  • Average UV index in December: 2

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in December
Cheyenne, WY

Average cloud cover in December - Cheyenne, WY
  • Average cloud cover in December: 28

The months with the most cloud cover are April and May (Cloud cover 32).
The month with the least cloud cover is September (Cloud cover 18).

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Average visibility in December
Cheyenne, WY

Average visibility in December - Cheyenne, WY
  • 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).

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