December Weather in Wyoming, United States

Last updated: June 24, 2025

In December, the average temperature in Wyoming, United States hovers around 6°C (43°F). However, be prepared for a chill, as minimums can drop to -9°C (17°F), while the mercury can rise to a comfortable 20°C (68°F). During this month, you can expect 103 mm (4.0 in) of precipitation over approximately 9 days, with an average humidity of 84%, adding to the overall atmosphere.

December Temperature in Wyoming

In December in Wyoming, the average temperature is 6°C (43°F). The maximum can reach 20°C (68°F), while the minimum can drop as low as -9°C (17°F). Be prepared for a wide range of temperatures when traveling to Wyoming during this time of year.

December Weather in Wyoming: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Wyoming, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wyoming, December typically has an average temperature of 6°C (43°F), with highs reaching up to 20°C (68°F) and lows dropping to around -9°C (17°F).

Data source: Temperature data for Wyoming generated using information from the Copernicus Climate Change Service.

December Precipitation in Wyoming

In Wyoming in December, the precipitation amount is 103 mm (4.0 in) over the course of 9 days.

December Precipitation Trends in Wyoming

The chart displays monthly precipitation patterns in Wyoming, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Wyoming, December typically receives around 103 mm (4.0 inches) of precipitation spread over approximately 9 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Wyoming

In Wyoming in December, humidity is 84%. With an average temperature of 6°C (43°F), this humidity feels like a damp chill that penetrates your clothing, making outdoor excursions uncomfortable and prompting travelers to seek refuge indoors or find warm, sheltered spots to enjoy their surroundings.

December Average Humidity in Wyoming

This chart illustrates the average monthly humidity levels in Wyoming, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Wyoming is approximately 84%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Wyoming

In Wyoming in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Wyoming, you can check the information here.

Maximum UV Index Levels in Wyoming for December

The chart shows the monthly maximum UV Index (UVI) for Wyoming in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In December, the maximum UV index in Wyoming typically reaches 3, which falls under the moderate exposure category.

Data source: Wyoming December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How December Weather in Wyoming Compares to Other Months

Weather in Wyoming varies notably across the year, with each month offering distinct climate conditions. This page compares December’s weather to other months in Wyoming, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Wyoming, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (38°F)	63 mm (2.5 inches)	84%	moderate
February Weather	5°C (41°F)	104 mm (4.1 inches)	83%	moderate
March Weather	8°C (46°F)	104 mm (4.1 inches)	83%	high
April Weather	13°C (56°F)	93 mm (3.7 inches)	81%	very high
May Weather	18°C (65°F)	128 mm (5.1 inches)	78%	very high
June Weather	23°C (74°F)	107 mm (4.2 inches)	79%	very high
July Weather	26°C (80°F)	152 mm (6.0 inches)	74%	very high
August Weather	25°C (78°F)	179 mm (7.0 inches)	72%	very high
September Weather	22°C (73°F)	103 mm (4.1 inches)	75%	very high
October Weather	17°C (64°F)	128 mm (5.0 inches)	81%	high
November Weather	10°C (50°F)	83 mm (3.3 inches)	85%	moderate
December Weather	6°C (43°F)	103 mm (4.0 inches)	84%	moderate