December weather forecast
Devils Tower, WY

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Weather in December

December brings in the wintry charm to Devils Tower, as snow falls and temperatures plunge steadily. Continuation from November's dipping temperatures opens up a snowy panorama, with a further increase in snowfall up to 4.09" (104mm). Despite the shorter daylight hours and colder nights, the holiday season brings a festive atmosphere to the county. Regular snowfall combined with freezing temperatures paints a perfect winter picture. An upcoming January promises more snow and colder temperatures, carrying forward the winter magic into the new year.

Temperature

December is the month when Devils Tower, Wyoming, experiences its coldest temperatures, averaging a high of 30.9°F (-0.6°C) and a low of 18.5°F (-7.5°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

In December, the rain falls for 3.5 days. Throughout December, 0.71" (18mm) of precipitation is accumulated. In Devils Tower, during the entire year, the rain falls for 99.6 days and collects up to 15.71" (399mm) of precipitation.

Snowfall

Months with snowfall are January through May, September through December. In Devils Tower, in December, during 9 snowfall days, 4.09" (104mm) of snow is typically accumulated. Throughout the year, there are 57 snowfall days, and 36.46" (926mm) of snow is accumulated.

Daylight

The month with the shortest days in Devils Tower is December, with an average of 8h and 54min of daylight.
On the first day of December, sunrise is at 7:16 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:28 pm MST.

Sunshine

February and December, with an average of 5.7h of sunshine, are months with the least sunshine.

UV index

The months with the lowest UV index are January, February, April, 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 exposure to the Sun's UV radiation for average individuals.
Note: In December, a daily UV index of 2 turns into the following recommendations:
The majority are not significantly affected by prolonged sun exposure. Infants, children, and those with fair skin must always have protection. Direct Sun exposure should be minimized especially during midday when radiation is most intense. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Updated: Aug 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

In Devils Tower, December is the coldest month, with temperatures averaging a high of 30.9°F (-0.6°C) and a low of 18.5°F (-7.5°C).

How cold is it in December?

The high-temperature, in December, in Devils Tower, records 30.9°F (-0.6°C), while the low-temperature is 18.5°F (-7.5°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which factors the actual air temperature with the relative humidity, is estimated at 82.4°F (28°C).

What is the average humidity in December?

In December, the average relative humidity is 76%.

How many days does it rain in December?

In December, the rain falls for 3.5 days. Throughout December, 0.71" (18mm) of precipitation is accumulated.

How many days does it snow in December?

In Devils Tower, in December, snow falls for 9 days, with typically accumulated 4.09" (104mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 8h and 54min of daylight.

How many hours of daylight does Devils Tower have in December?

The average day length in December is 8h and 53min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:16 am and sunset at 4:20 pm. On the last day of the month, sunrise is at 7:35 am and sunset at 4:28 pm MST.

What are the months with the least sunshine?

The months with the least sunshine are February and December, with an average of 5.7h of sunshine.

How long on average sun shines in December?

The average sunshine duration in December is 5.7h.

When is the lowest UV index?

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

How high is the UV index in December?

In Devils Tower, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from 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
Devils Tower, WY

Average temperature in December - Devils Tower, WY
  • Average high temperature in December: 30.9°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is December (30.9°F).

  • Average low temperature in December: 18.5°F

The month with the highest average low temperature is July (61°F).
The coldest month (with the lowest average low temperature) is February (16.2°F).

Average pressure in December
Devils Tower, WY

Average pressure in December - Devils Tower, 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 (29.84"Hg).

Average wind speed in December
Devils Tower, WY

Average wind speed in December - Devils Tower, WY
  • Average wind speed in December: 9.9mph

The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (8mph).

Average humidity in December
Devils Tower, WY

Average humidity in December - Devils Tower, WY
  • Average humidity in December: 76%

The month with the highest relative humidity is January (79%).
The months with the lowest relative humidity are August and September (49%).

Average rainfall in December
Devils Tower, WY

Average rainfall in December - Devils Tower, WY
  • Average rainfall in December: 0.71"

The wettest month (with the highest rainfall) is May (2.32").
The driest month (with the least rainfall) is January (0.59").

Average rainfall days in December
Devils Tower, WY

Average rainfall days in December - Devils Tower, WY
  • Average rainfall days in December: 3.5 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (2.9 days).

Average snowfall in December
Devils Tower, WY

Average snowfall in December - Devils Tower, WY
  • Average snowfall in December: 4.09"

The month with the highest snowfall is April (7.36").
The months with the least snowfall are June, July and August (0").

Average snowfall days in December
Devils Tower, WY

Average snowfall days in December - Devils Tower, WY
  • Average snowfall days in December: 9 days

The month with the highest number of snowfall days is February (11.2 days).
The months with the least snowfall days are June, July and August (0 days).

Average daylight in December /
Average sunshine in December
Devils Tower, WY

Average daylight in December / Average sunshine in December - Devils Tower, WY
  • Average daylight in December: 8h and 5min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in December: 5h and 4min

The month with the most sunshine is August (Average sunshine: 11h and 42min).
The months with the least sunshine are February and December (Average sunshine: 5h and 42min).

Average sunshine days in December
Devils Tower, WY

Average sunshine days in December - Devils Tower, WY
  • Average sunshine days in December: 19.9 days

The months with the most sunshine days are September and November (20.3 days).
The month with the least sunshine days is May (12.7 days).

Average UV index in December
Devils Tower, WY

Average UV index in December - Devils Tower, WY
  • Average UV index in December: 2

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

Average cloud cover in December
Devils Tower, WY

Average cloud cover in December - Devils Tower, WY
  • Average cloud cover in December: 39

The month with the most cloud cover is February (Cloud cover 41).
The month with the least cloud cover is August (Cloud cover 16).

Average visibility in December
Devils Tower, WY

Average visibility in December - Devils Tower, 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).

Devils Tower, Wyoming, USA

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