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January Weather in Helena, United States

Last updated: June 24, 2025

In Helena, United States, the average temperature in January hovers around 3°C (37°F). Expect a minimum dip to -17°C (2°F) and a maximum rise to 24°C (76°F). During this month, you can anticipate 35 mm (1.4 in) of precipitation over 4 days, with an average humidity of 75%.

January Temperature in Helena

In January, in Helena, the average temperature is 3°C (37°F). Maximums can reach 24°C (76°F) and minimums can be as low as -17°C (2°F). It's advisable to pack layers and prepare for a wide range of weather conditions when traveling.

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 3°C (37°F), with highs reaching up to 24°C (76°F) and lows dropping to around -17°C (2°F).
JanFebMarAprMayJunJulAugSepOctNovDec373852586979838075604841
Data source: Temperature data for Helena generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Helena

In Helena in January, the precipitation amount is 35 mm (1.4 in) over a span of 4 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 35 mm (1.4 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec35247782143112456959862129
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Helena

In Helena in January, humidity is 75%. With an average temperature of 3°C (37°F), this humidity feels like a chilly damp embrace, making travel seem quite uncomfortable as the cold penetrates through clothing, leaving you feeling clammy and heavy rather than refreshed.

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 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%76%67%70%82%82%81%76%67%72%80%83%
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.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109753
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.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)35 mm (1.4 inches)75%moderate
February Weather3°C (38°F)24 mm (1.0 inches)76%high
March Weather11°C (52°F)77 mm (3.0 inches)67%very high
April Weather15°C (59°F)82 mm (3.2 inches)70%very high
May Weather20°C (69°F)143 mm (5.6 inches)82%extreme
June Weather26°C (80°F)112 mm (4.4 inches)82%extreme
July Weather28°C (83°F)45 mm (1.8 inches)81%extreme
August Weather27°C (81°F)69 mm (2.7 inches)76%very high
September Weather24°C (76°F)59 mm (2.3 inches)67%very high
October Weather16°C (61°F)86 mm (3.4 inches)72%high
November Weather9°C (49°F)21 mm (0.8 inches)80%moderate
December Weather5°C (42°F)29 mm (1.2 inches)83%moderate

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