Cheyenne
Wyoming, USA
Long-term weather forecast
Long-term weather forecast

December weather forecast and climate
Cheyenne, WY

A sunny day in the front of the State Capitol building in Cheyenne, Wyoming
A sunny day in the front of the State Capitol building in Cheyenne, Wyoming
The first month of the winter, December, is also a wintry month in Cheyenne, Wyoming, with average temperature ranging between max 34.7°F (1.5°C) and min 20.3°F (-6.5°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 Cheyenne, the average relative humidity is 63%.

Rainfall

In Cheyenne, Wyoming, during 5.5 rainfall days, 0.59" (15mm) of precipitation is typically accumulated. Throughout the year, there are 116 rainfall days, and 14.57" (370mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Cheyenne, Wyoming, during December, snow falls for 9.6 days and regularly aggregates up to 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

The month with the shortest days in Cheyenne, Wyoming, is December, with an average of 9.3h of daylight.

Sunshine

In Cheyenne, the average sunshine in December is 6.6h.

UV index

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 estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 2 transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. 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 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.

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 temperature in December in Cheyenne?

In December, the average high-temperature is 34.7°F (1.5°C), and the average low-temperature is 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, Wyoming, 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 December, it is snowing for 9.6 days. Throughout December, 2.8" (71mm) of snow is accumulated.

What is the month with the shortest days in Cheyenne?

December has the shortest days of the year in Cheyenne, with an average of 9.3h of daylight.

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

In Cheyenne, the average length of the day in December is 9.3h.

How long on average sun shines in December in Cheyenne?

In Cheyenne, the average sunshine in December is 6.6h.

When is the lowest UV index in Cheyenne?

Months with the lowest UV index in Cheyenne, Wyoming, 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, Wyoming, is 2. A UV Index reading of 2, and below, represents a low health threat from the exposure to the Sun's UV rays.
Average temperature in December - Cheyenne, WY
  • Average high temperature in December: 1.5°C

The warmest month (with the highest average high temperature) is July (28°C).
The month with the lowest average high temperature is December (1.5°C).

  • Average low temperature in December: -6.5°C

The month with the highest average low temperature is July (15.5°C).
The coldest month (with the lowest average low temperature) is December (-6.5°C).

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%).

Average rainfall in December - Cheyenne, WY
  • Average rainfall in December: 15mm

The wettest month (with the highest rainfall) is May (75mm).
The driest month (with the lowest rainfall) is January (11mm).

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 lowest number of rainy days is January (4.7 days).

Average snowfall in December - Cheyenne, WY
  • Average snowfall in December: 71mm

The month with the highest snowfall is March (154mm).
Months with the lowest snowfall are June, July, August and September (0mm).

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).
Months with the lowest number of snowfall days are June, July and August (0 days).

Average daylight in December / Average sunshine in December - Cheyenne, WY
  • Average daylight in December: 9.3h

The month with the longest days is June (Average daylight: 15.1h).
The month with shortest days is December (Average daylight: 9.3h).

  • Average sunshine in December: 6.6h

Months with most sunshine are July and August (Average sunshine: 11.6h).
The month with least sunshine is February (Average sunshine: 6.5h).

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

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