December Weather in Greybull, United States

Last updated: June 24, 2025

In December, the average temperature in Greybull, United States hovers around -2°C (29°F). However, be prepared for a wide range: temperatures can plunge to a chilling -25°C (-12°F) or climb to a pleasant 19°C (66°F). Expect approximately 14 mm (0.5 in) of precipitation spread over 4 days, accompanied by a high average humidity of 87%. Stay warm and dry!

December Temperature in Greybull

In December in Greybull, the average temperature is -2°C (29°F), with maximums reaching 19°C (66°F) and minimums dropping as low as -25°C (-12°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both cold and mild conditions.

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

The chart illustrates December temperature patterns in Greybull, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Greybull, December typically has an average temperature of -2°C (29°F), with highs reaching up to 19°C (66°F) and lows dropping to around -25°C (-12°F).

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

December Precipitation in Greybull

In Greybull in December, the precipitation amount is 14 mm (0.5 in) over a span of 4 days.

December Precipitation Trends in Greybull

The chart displays monthly precipitation patterns in Greybull, 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 Greybull, December typically receives around 14 mm (0.5 inches) of precipitation spread over approximately 4 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 Greybull

In Greybull in December humidity is 87%. With an average temperature of -2°C (29°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it challenging to enjoy outdoor activities.

December Average Humidity in Greybull

This chart illustrates the average monthly humidity levels in Greybull, 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 Greybull is approximately 87%, 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 Greybull

In Greybull in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Greybull, you can visit Hourly UV Index in Greybull.

Maximum UV Index Levels in Greybull for December

The chart shows the monthly maximum UV Index (UVI) for Greybull 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 Greybull typically reaches 2, which falls under the low exposure category.

Data source: Greybull 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 Greybull Compares to Other Months

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

This table compares monthly weather conditions in Greybull, 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 (27°F)	10 mm (0.4 inches)	85%	moderate
February Weather	-5°C (24°F)	21 mm (0.8 inches)	85%	moderate
March Weather	5°C (40°F)	14 mm (0.5 inches)	79%	high
April Weather	8°C (46°F)	30 mm (1.2 inches)	74%	very high
May Weather	13°C (56°F)	37 mm (1.5 inches)	76%	very high
June Weather	20°C (69°F)	14 mm (0.5 inches)	79%	extreme
July Weather	25°C (77°F)	7 mm (0.3 inches)	81%	extreme
August Weather	23°C (73°F)	11 mm (0.4 inches)	80%	very high
September Weather	17°C (63°F)	30 mm (1.2 inches)	76%	very high
October Weather	7°C (45°F)	29 mm (1.1 inches)	74%	high
November Weather	2°C (37°F)	12 mm (0.5 inches)	81%	moderate
December Weather	-2°C (29°F)	14 mm (0.5 inches)	87%	low