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January Weather in Great Falls, United States

Last updated: June 24, 2025

In January, the average temperature in Great Falls, United States hovers around -3°C (27°F), with minimums plummeting as low as -31°C (-23°F) and a maximum reaching 11°C (52°F). Expect some moisture, as 16 mm (0.6 in) of precipitation typically falls over 4 days, while the air remains quite damp with an average humidity of 87%.

January Temperature in Great Falls

In January in Great Falls, the average temperature is -3°C (27°F), with maximums reaching 11°C (52°F) and minimums dropping as low as -31°C (-23°F). Travelers should be prepared for a wide range of temperatures and pack accordingly for both chilly and milder weather.

January Weather in Great Falls: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Great Falls, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Great Falls, January typically has an average temperature of -3°C (27°F), with highs reaching up to 11°C (52°F) and lows dropping to around -31°C (-23°F).
JanFebMarAprMayJunJulAugSepOctNovDec271934425464737059453729
Data source: Temperature data for Great Falls 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 Great Falls

In Great Falls in January, the precipitation amount is 16 mm (0.6 in) over a span of 4 days.

January Precipitation Trends in Great Falls

The chart displays monthly precipitation patterns in Great Falls, 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 Great Falls, January typically receives around 16 mm (0.6 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec164125606571122336383228
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Great Falls

In Great Falls in January humidity is 87%. With an average temperature of -3°C (27°F), this humidity feels like an icy blanket that wraps around you, making outdoor activities challenging as the cold air mingles with the dampness, leaving travelers feeling chilled to the bone even in short bursts outside.

January Average Humidity in Great Falls

This chart illustrates the average monthly humidity levels in Great Falls, 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 Great Falls is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%88%83%78%76%78%77%71%68%72%84%91%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Great Falls

In Great Falls in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Great Falls, you can visit Hourly UV Index in Great Falls.

Maximum UV Index Levels in Great Falls for January

The chart shows the monthly maximum UV Index (UVI) for Great Falls 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 Great Falls typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Great Falls 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 Great Falls Compares to Other Months

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

This table compares monthly weather conditions in Great Falls, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (27°F)16 mm (0.6 inches)87%low
February Weather-7°C (20°F)41 mm (1.6 inches)88%moderate
March Weather1°C (34°F)25 mm (1.0 inches)83%moderate
April Weather6°C (43°F)60 mm (2.4 inches)78%high
May Weather12°C (55°F)65 mm (2.5 inches)76%very high
June Weather18°C (64°F)71 mm (2.8 inches)78%very high
July Weather23°C (73°F)12 mm (0.5 inches)77%very high
August Weather21°C (70°F)23 mm (0.9 inches)71%very high
September Weather15°C (60°F)36 mm (1.4 inches)68%high
October Weather7°C (45°F)38 mm (1.5 inches)72%moderate
November Weather3°C (37°F)32 mm (1.3 inches)84%moderate
December Weather-2°C (29°F)27 mm (1.1 inches)90%low

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