December Weather in Caspar, United States

Last updated: June 24, 2025

In December, the average temperature in Caspar, United States sits at a mild 10°C (50°F). Expect minimums dropping to 2°C (35°F) and warming up to a comfortable 20°C (68°F). However, be prepared for 97 mm (3.8 in) of precipitation, spread over around 11 days, contributing to an average humidity of 84%. Perfect for cozy indoor activities or rainy adventures!

December Temperature in Caspar

In December in Caspar, the average temperature is 10°C (50°F). Maximums can reach 20°C (68°F), and minimums can be as low as 2°C (35°F). It's a great time for travelers to explore Caspar while enjoying mild weather and the beauty of the season.

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

The chart illustrates December temperature patterns in Caspar, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Caspar, December typically has an average temperature of 10°C (50°F), with highs reaching up to 20°C (68°F) and lows dropping to around 2°C (35°F).

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

December Precipitation in Caspar

In Caspar in December, the total precipitation amount is 97 mm (3.8 in) over the course of 11 days.

December Precipitation Trends in Caspar

The chart displays monthly precipitation patterns in Caspar, 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 Caspar, December typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 11 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 Caspar

In Caspar in December, humidity is 84%. With an average temperature of 10°C (50°F), this humidity feels like a chilly dampness that clings to your skin, making outdoor activities less comfortable and prompting travelers to seek refuge in cozy, warm cafes or indoor attractions.

December Average Humidity in Caspar

This chart illustrates the average monthly humidity levels in Caspar, 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 Caspar 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 Caspar

In Caspar 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 Caspar, you can check the information here.

Maximum UV Index Levels in Caspar for December

The chart shows the monthly maximum UV Index (UVI) for Caspar 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 Caspar typically reaches 3, which falls under the moderate exposure category.

Data source: Caspar 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 Caspar Compares to Other Months

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

This table compares monthly weather conditions in Caspar, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	147 mm (5.8 inches)	86%	moderate
February Weather	10°C (50°F)	137 mm (5.4 inches)	84%	moderate
March Weather	10°C (51°F)	108 mm (4.2 inches)	83%	high
April Weather	12°C (54°F)	60 mm (2.4 inches)	80%	very high
May Weather	14°C (57°F)	43 mm (1.7 inches)	80%	extreme
June Weather	16°C (62°F)	2 mm (0.1 inches)	76%	extreme
July Weather	17°C (63°F)	2 mm (0.1 inches)	70%	extreme
August Weather	18°C (64°F)	1 mm (0.0 inches)	66%	very high
September Weather	18°C (64°F)	6 mm (0.2 inches)	68%	very high
October Weather	15°C (60°F)	43 mm (1.7 inches)	72%	high
November Weather	12°C (53°F)	72 mm (2.8 inches)	84%	moderate
December Weather	10°C (50°F)	97 mm (3.8 inches)	84%	moderate