December weather forecast
Cheyenne, WY

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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

As the curtain of the year begins to close, December sets in with its cold winter weather. The days in Cheyenne get considerably shorter, and frost embellishes the windows. With a maximum temperature barely making to 34.7°F, the holiday season is consumed in the enveloping chill. Despite the frigid conditions, the spirit of the festivities imparts warmth and enjoyment, closing out the year on a pleasant note.

Temperature

December, marked by an average high-temperature of 34.7°F and a low-temperature of 20.3°F, is the coldest month in Cheyenne.

Humidity

The average relative humidity in December in Cheyenne is 63%.

Rainfall

In December, the rain falls for 5.5 days. Throughout December, 0.59" of precipitation is accumulated. Throughout the year, in Cheyenne, there are 116 rainfall days, and 14.57" of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Cheyenne. In Cheyenne, during December, snow falls for 9.6 days and regularly aggregates up to 2.8" of snow. In Cheyenne, during the entire year, snow falls for 62 days and aggregates up to 30.51" of snow.

Daylight

The month with the shortest days in Cheyenne is December, with an average of 9h and 18min 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, in Cheyenne, sunrise is at 7:24 am and sunset at 4:40 pm MST.

Sunshine

In Cheyenne, Wyoming, the average sunshine in December 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. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high daily UV index of 2 during December translates into the following directions:
Most individuals can handle sun exposure for up to an hour without burning, but children must always be shielded from sun exposure. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
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FAQ

What is the coldest time of year in Cheyenne?

In Cheyenne, December is the coldest month, with temperatures averaging a high of 34.7°F and a low of 20.3°F.

How cold is December in Cheyenne?

December temperatures in Cheyenne vary between a high-temperature of 34.7°F and a low-temperature of 20.3°F. The average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, in August is computed to be 80.6°F.

What is the average humidity in December in Cheyenne?

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

How much does it rain in Cheyenne in December?

In Cheyenne, Wyoming, in December, during 5.5 rainfall days, 0.59" of precipitation is typically accumulated.

How much does it snow in Cheyenne in December?

In Cheyenne, Wyoming, in December, snow falls for 9.6 days, with typically accumulated 2.8" of snow.

What is the month with the shortest days in Cheyenne?

December has the shortest days of the year in Cheyenne, Wyoming, with an average of 9h and 18min of daylight.

How many hours of daylight does Cheyenne have in December?

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

When is the sunrise / sunset in December in Cheyenne?

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

How many hours of sunshine does Cheyenne have in December?

In December, the average sunshine duration in Cheyenne, Wyoming, 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.

How high is the UV index in December in Cheyenne?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health threat from exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average pressure
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
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 2min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 6h and 4min

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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Cheyenne, Wyoming, USA

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