December weather forecastThermopolis, WY
December
Weather in December
December brings the full wrath of winter to Thermopolis, with cold temperatures, limited daylight and the chance for snowfall. The winter wonderland experienced in this month gets approximately 2.83" (72mm) of snow distributed over roughly ten days. The days are at their shortest, and the temperatures are close to the chilling lows of January. As the year concludes, the serenity of the snow-covered landscapes provides a reflective atmosphere. December's weather, characterized by its winter chill, concludes the yearly cycle of diverse weather patterns in Thermopolis, Wyoming.Temperature
December is the coldest month in Thermopolis, with an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 12.9°F (-10.6°C).Humidity
In December, the average relative humidity is 78%.Rainfall
In December, in Thermopolis, the rain falls for 4.3 days. Throughout December, 0.51" (13mm) of precipitation is accumulated. Throughout the year, there are 117.2 rainfall days, and 11.14" (283mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. In December, in Thermopolis, it is snowing for 9.8 days. Throughout December, 2.83" (72mm) of snow is accumulated. In Thermopolis, during the entire year, snow falls for 51.2 days and aggregates up to 21.3" (541mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 0min of daylight.On the first day of the month, sunrise is at 7:27 am and sunset at 4:37 pm. On the last day of December, sunrise is at 7:46 am and sunset at 4:46 pm MST.
Sunshine
In December, the average sunshine is 6.5h.UV index
The months with the lowest UV index are January through April, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for ordinary individuals.Note: The average daily UV index of 2 in December transforms into the following instructions:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Thermopolis, WY
- Average high temperature in December: 28.2°F
The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is December (28.2°F).
- Average low temperature in December: 12.9°F
The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (12.6°F).
Average pressure in December
Thermopolis, WY
- Average pressure in December: 30.17"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Thermopolis, WY
- Average wind speed in December: 5.2mph
The windiest month (with the highest average wind speed) is April (7.1mph).
The calmest month (with the lowest average wind speed) is January (5mph).
Average humidity in December
Thermopolis, WY
- Average humidity in December: 78%
The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (35%).
Average rainfall in December
Thermopolis, WY
- Average rainfall in December: 0.51"
The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is January (0.43").
Average rainfall days in December
Thermopolis, WY
- Average rainfall days in December: 4.3 days
The month with the highest number of rainy days is May (17 days).
The months with the least rainy days are January and December (4.3 days).
Average snowfall in December
Thermopolis, WY
- Average snowfall in December: 2.83"
The month with the highest snowfall is February (4.57").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Thermopolis, WY
- Average snowfall days in December: 9.8 days
The month with the highest number of snowfall days is February (11.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Thermopolis, WY
- Average daylight in December: 9h and 0min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in December: 6h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).
Average sunshine days in December
Thermopolis, WY
- Average sunshine days in December: 20.1 days
The month with the most sunshine days is January (20.2 days).
The month with the least sunshine days is May (10.1 days).
Average UV index in December
Thermopolis, 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, March, April, November and December (UV index 2).
Average cloud cover in December
Thermopolis, WY
- Average cloud cover in December: 32
The month with the most cloud cover is February (Cloud cover 35).
The months with the least cloud cover are July and August (Cloud cover 14).
Average visibility in December
Thermopolis, WY
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
