January Weather in Gillette, United States

Last updated: June 24, 2025

In January, the average temperature in Gillette, United States hovers around -3°C (27°F), with minimums plunging to -25°C (-12°F) and maximums reaching up to 14°C (58°F). Expect approximately 19 mm (0.8 in) of precipitation spread over 5 days, and enjoy a notable average humidity of 78%.

January Temperature in Gillette

In January in Gillette, the average temperature is -3°C (27°F). The maximum can reach 14°C (58°F), while the minimum can plummet to -25°C (-12°F). Travelers should be prepared for a wide range of temperatures and bring appropriate clothing for both chilly and moderately warm conditions.

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

The chart illustrates January temperature patterns in Gillette, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Gillette, January typically has an average temperature of -3°C (27°F), with highs reaching up to 14°C (58°F) and lows dropping to around -25°C (-12°F).

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

January Precipitation in Gillette

In Gillette in January, the total precipitation amount is 19 mm (0.8 in), occurring over the course of 5 days.

January Precipitation Trends in Gillette

The chart displays monthly precipitation patterns in Gillette, 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 Gillette, January typically receives around 19 mm (0.8 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 Gillette

In Gillette in January, humidity is 78%. With an average temperature of -3°C (27°F), this humidity feels like a biting chill that seeps into your bones, making winter travel particularly uncomfortable and demanding.

January Average Humidity in Gillette

This chart illustrates the average monthly humidity levels in Gillette, 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 Gillette is approximately 78%, 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 Gillette

In Gillette in January, 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 Gillette, you can check the information here.

Maximum UV Index Levels in Gillette for January

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

Data source: Gillette 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 Gillette Compares to Other Months

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

This table compares monthly weather conditions in Gillette, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-3°C (27°F)	19 mm (0.8 inches)	78%	moderate
February Weather	-5°C (23°F)	26 mm (1.0 inches)	79%	moderate
March Weather	3°C (38°F)	33 mm (1.3 inches)	71%	high
April Weather	6°C (42°F)	61 mm (2.4 inches)	70%	very high
May Weather	12°C (53°F)	67 mm (2.6 inches)	75%	very high
June Weather	19°C (67°F)	39 mm (1.6 inches)	82%	extreme
July Weather	23°C (74°F)	56 mm (2.2 inches)	84%	extreme
August Weather	21°C (71°F)	35 mm (1.4 inches)	85%	very high
September Weather	16°C (62°F)	43 mm (1.7 inches)	79%	very high
October Weather	6°C (44°F)	47 mm (1.9 inches)	75%	moderate
November Weather	3°C (37°F)	20 mm (0.8 inches)	75%	moderate
December Weather	-1°C (30°F)	24 mm (0.9 inches)	81%	low