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December Weather in Wyoming, United States

Last updated: June 24, 2025

In December, the average temperature in Wyoming, United States hovers around 4°C (39°F). Expect chilly extremes with a minimum of -16°C (4°F) and the possibility of warmer days reaching up to 19°C (67°F). During this period, precipitation totals about 110 mm (4.3 in) spread over 10 days, contributing to an average humidity of 87%. Be prepared for a damp but invigorating climate!

December Temperature in Wyoming

In December in Wyoming, the average temperature is 4°C (39°F). Maximum can reach 19°C (67°F) and minimum can be as low as -16°C (4°F). Be sure to pack layers to stay comfortable while exploring the diverse weather conditions.

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 4°C (39°F), with highs reaching up to 19°C (67°F) and lows dropping to around -16°C (4°F).
JanFebMarAprMayJunJulAugSepOctNovDec333745546674787571594439
Data source: Temperature data for Wyoming generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Wyoming

In Wyoming in December, the precipitation amount is 110 mm (4.3 in) over a period of 10 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 110 mm (4.3 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec8010713711912713111089819699110
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Wyoming

In Wyoming in December, humidity is 87%. With an average temperature of 4°C (39°F), this humidity feels like a damp chill that seeps into your bones, making travel uncomfortable and gritty, as the air hangs heavy and clings to your skin.

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 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
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.
 TemperaturePrecipitationHumidityUV
January Weather1°C (33°F)80 mm (3.2 inches)88%moderate
February Weather3°C (37°F)107 mm (4.2 inches)88%moderate
March Weather7°C (45°F)137 mm (5.4 inches)87%high
April Weather12°C (55°F)119 mm (4.7 inches)85%very high
May Weather19°C (66°F)127 mm (5.0 inches)81%very high
June Weather23°C (74°F)131 mm (5.2 inches)82%very high
July Weather25°C (78°F)110 mm (4.3 inches)81%very high
August Weather24°C (75°F)89 mm (3.5 inches)73%very high
September Weather21°C (71°F)81 mm (3.2 inches)73%very high
October Weather15°C (59°F)96 mm (3.8 inches)78%high
November Weather7°C (44°F)99 mm (3.9 inches)89%moderate
December Weather4°C (39°F)110 mm (4.3 inches)87%moderate

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