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January Weather in Lewistown, United States

Last updated: June 24, 2025

In Lewistown, United States, the average temperature for January hovers around -4°C (25°F). Temperatures can dip as low as -31°C (-24°F) and may reach a pleasant maximum of 10°C (51°F). Expect about 25 mm (1.0 in) of precipitation spread over 6 days, and keep in mind the weather can feel quite damp with an average humidity of 81%.

January Temperature in Lewistown

In January in Lewistown, the average temperature is -4°C (25°F). The maximum can reach 10°C (51°F), and the minimum can be as low as -31°C (-24°F). It’s advisable to pack warm clothing and be prepared for extreme weather conditions if you plan to travel during this time.

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

The chart illustrates January temperature patterns in Lewistown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lewistown, January typically has an average temperature of -4°C (25°F), with highs reaching up to 10°C (51°F) and lows dropping to around -31°C (-24°F).
JanFebMarAprMayJunJulAugSepOctNovDec251832385060696757413426
Data source: Temperature data for Lewistown 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 Lewistown

In Lewistown in January, the precipitation amount is 25 mm (1.0 in) spread over 6 days.

January Precipitation Trends in Lewistown

The chart displays monthly precipitation patterns in Lewistown, 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 Lewistown, January typically receives around 25 mm (1.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec254329768480303145453431
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Lewistown

In Lewistown in January humidity is 81%. With an average temperature of -4°C (25°F), this humidity feels like an icy blanket wrapping around you, making travel quite uncomfortable as each breath draws in a damp chill, often leaving you shivering and increasingly wary of the frosty air.

January Average Humidity in Lewistown

This chart illustrates the average monthly humidity levels in Lewistown, 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 Lewistown is approximately 81%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%85%77%72%75%78%79%76%67%69%78%85%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Lewistown

In Lewistown 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 Lewistown, you can visit Hourly UV Index in Lewistown.

Maximum UV Index Levels in Lewistown for January

The chart shows the monthly maximum UV Index (UVI) for Lewistown 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 Lewistown typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101098532
Data source: Lewistown 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 Lewistown Compares to Other Months

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

This table compares monthly weather conditions in Lewistown, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)25 mm (1.0 inches)81%low
February Weather-8°C (18°F)43 mm (1.7 inches)85%moderate
March Weather0°C (32°F)29 mm (1.2 inches)77%moderate
April Weather3°C (38°F)76 mm (3.0 inches)72%very high
May Weather10°C (50°F)84 mm (3.3 inches)75%very high
June Weather16°C (61°F)80 mm (3.2 inches)78%very high
July Weather20°C (69°F)30 mm (1.2 inches)79%very high
August Weather19°C (67°F)31 mm (1.2 inches)76%very high
September Weather14°C (57°F)45 mm (1.8 inches)67%very high
October Weather5°C (42°F)45 mm (1.8 inches)69%moderate
November Weather1°C (34°F)34 mm (1.3 inches)78%moderate
December Weather-3°C (27°F)31 mm (1.2 inches)85%low

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