January Weather in Casper, United States

Last updated: June 24, 2025

In January, the average temperature in Casper, United States hovers around -6°C (21°F), with occasional dips to a chilling -27°C (-17°F) and peaks reaching up to 7°C (45°F). Expect about 23 mm (0.9 in) of precipitation over 5 days, paired with an average humidity of 79%. Stay warm and prepared for the wintry conditions!

January Temperature in Casper

In January in Casper, the average temperature is -6°C (21°F). The maximum can reach 7°C (45°F), while the minimum can drop as low as -27°C (-17°F). Travelers should be prepared for cold conditions and dress warmly when visiting during this time.

January Weather in Casper: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Casper, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Casper, January typically has an average temperature of -6°C (21°F), with highs reaching up to 7°C (45°F) and lows dropping to around -27°C (-17°F).

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

January Precipitation in Casper

In Casper in January, the precipitation amount is 23 mm (0.9 in) over the course of 5 days.

January Precipitation Trends in Casper

The chart displays monthly precipitation patterns in Casper, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Casper, January typically receives around 23 mm (0.9 inches) of precipitation spread over approximately 5 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Casper

In Casper in January, humidity is 79%. With an average temperature of -6°C (21°F), this humidity feels like an icy embrace, making it essential for travelers to bundle up and prepare for the sharp, penetrating chill that hangs in the air, creating a biting sensation that can quickly drain your energy.

January Average Humidity in Casper

This chart illustrates the average monthly humidity levels in Casper, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Casper is approximately 79%, offering insight into how humid the weather typically is during this month.

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

January UV Index in Casper

In Casper in January, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Casper for better planning.

Maximum UV Index Levels in Casper for January

The chart shows the monthly maximum UV Index (UVI) for Casper in January, 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 January, the maximum UV index in Casper typically reaches 4, which falls under the moderate exposure category.

Data source: Casper January 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 January Weather in Casper Compares to Other Months

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

This table compares monthly weather conditions in Casper, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-6°C (21°F)	23 mm (0.9 inches)	79%	moderate
February Weather	-7°C (19°F)	31 mm (1.2 inches)	81%	high
March Weather	-1°C (31°F)	48 mm (1.9 inches)	70%	high
April Weather	3°C (38°F)	59 mm (2.3 inches)	67%	extreme
May Weather	10°C (50°F)	70 mm (2.7 inches)	70%	very high
June Weather	18°C (65°F)	30 mm (1.2 inches)	75%	extreme
July Weather	22°C (72°F)	17 mm (0.7 inches)	76%	extreme
August Weather	21°C (69°F)	19 mm (0.7 inches)	76%	extreme
September Weather	16°C (60°F)	29 mm (1.2 inches)	72%	very high
October Weather	5°C (41°F)	43 mm (1.7 inches)	70%	high
November Weather	1°C (34°F)	26 mm (1.0 inches)	76%	moderate
December Weather	-5°C (24°F)	27 mm (1.1 inches)	81%	moderate