January Weather in Helena, United States

Last updated: June 24, 2025

In Helena, United States, the average temperature in January hovers around 7°C (44°F). Expect a chilly minimum of -13°C (8°F), contrasting sharply with a maximum of 24°C (75°F). With an average precipitation of 107 mm (4.2 in) spread over 9 days and humidity levels around 84%, prepare for a rather damp month ahead!

January Temperature in Helena

In January in Helena, the average temperature is 7°C (44°F), with maximums reaching 24°C (75°F) and minimums dropping as low as -13°C (8°F). Travelers should be prepared for a wide range of temperatures, making layers essential for comfort during their stay.

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

The chart illustrates January temperature patterns in Helena, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Helena, January typically has an average temperature of 7°C (44°F), with highs reaching up to 24°C (75°F) and lows dropping to around -13°C (8°F).

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

January Precipitation in Helena

In Helena in January, the precipitation amount is 107 mm (4.2 in), occurring over a span of 9 days.

January Precipitation Trends in Helena

The chart displays monthly precipitation patterns in Helena, 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 Helena, January typically receives around 107 mm (4.2 inches) of precipitation spread over approximately 9 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 Helena

In Helena in January humidity is 84%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making it uncomfortable for traveling and requiring extra layers to stay warm and dry.

January Average Humidity in Helena

This chart illustrates the average monthly humidity levels in Helena, 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 Helena is approximately 84%, 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 Helena

In Helena 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 Helena for better planning.

Maximum UV Index Levels in Helena for January

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

Data source: Helena 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 Helena Compares to Other Months

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

This table compares monthly weather conditions in Helena, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	7°C (44°F)	107 mm (4.2 inches)	84%	moderate
February Weather	9°C (48°F)	185 mm (7.3 inches)	83%	high
March Weather	14°C (57°F)	172 mm (6.8 inches)	81%	very high
April Weather	17°C (62°F)	146 mm (5.7 inches)	81%	very high
May Weather	23°C (73°F)	138 mm (5.5 inches)	83%	extreme
June Weather	26°C (79°F)	133 mm (5.2 inches)	83%	extreme
July Weather	28°C (82°F)	124 mm (4.9 inches)	81%	extreme
August Weather	27°C (81°F)	114 mm (4.5 inches)	74%	very high
September Weather	25°C (77°F)	92 mm (3.6 inches)	71%	very high
October Weather	19°C (66°F)	111 mm (4.4 inches)	76%	high
November Weather	11°C (52°F)	82 mm (3.2 inches)	84%	high
December Weather	9°C (49°F)	144 mm (5.7 inches)	88%	moderate