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 (1.5°C), 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 is the coldest month in Cheyenne, exhibiting average temperatures of 34.7°F (1.5°C) at the peak and 20.3°F (-6.5°C) at the base.

Humidity

In December, the average relative humidity is 63%.

Rainfall

In Cheyenne, during December, the rain falls for 5.5 days and regularly aggregates up to 0.59" (15mm) of precipitation. 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, in December, snow falls for 9.6 days, with typically accumulated 2.8" (71mm) of snow. In Cheyenne, during the entire year, snow falls for 62 days and aggregates up to 30.51" (775mm) of snow.

Daylight

December has the shortest days of the year in Cheyenne, Wyoming, 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 December, the average sunshine in Cheyenne is 6.6h.

UV index

The months with the lowest UV index in Cheyenne, Wyoming, are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
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Frequently asked questions

What is the coldest time of year in Cheyenne?

Cheyenne's December weather reaches an average high of 34.7°F (1.5°C) and an average low of 20.3°F (-6.5°C), making it the coldest month.

How cold is it in Cheyenne in December?

In December, the average high-temperature and low-temperature in Cheyenne, Wyoming, are 34.7°F (1.5°C) and 20.3°F (-6.5°C) respectively. The average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, in August is estimated at 80.6°F (27°C).

What is the average humidity in December in Cheyenne?

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

How many days does it rain in December in Cheyenne?

In Cheyenne, during December, the rain falls for 5.5 days and regularly aggregates up to 0.59" (15mm) of precipitation.

How many days does it snow in December in Cheyenne?

In Cheyenne, during December, snow falls for 9.6 days and regularly aggregates up to 2.8" (71mm) of snow.

What is the month with the shortest days in Cheyenne?

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

What is the average length of the day in December in Cheyenne?

The average day length in December in Cheyenne, Wyoming, is 9h and 16min.

When is the sunrise / sunset in December in Cheyenne?

On the first day of December, 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 long on average sun shines in December in Cheyenne?

The average sunshine duration in December is 6.6h.

When is the lowest UV index in Cheyenne?

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

What is the UV index reading in December in Cheyenne?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to UV radiation.
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 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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