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December Weather in Lewistown, United States

Last updated: June 24, 2025

In December, the average temperature in Lewistown, United States hovers around 2°C (36°F). Visitors can experience a chilly range, with minimums dropping to -13°C (8°F) and maximums peaking at 18°C (65°F). Prepare for a damp atmosphere, as the area receives approximately 91 mm (3.6 in) of precipitation over 11 days, resulting in an average humidity of 88%.

December Temperature in Lewistown

In December in Lewistown, the average temperature is 2°C (36°F). Maximums can reach 18°C (65°F) and minimums can be as low as -13°C (8°F). Be prepared for a range of temperatures and pack accordingly for your travels!

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

The chart illustrates December 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, December typically has an average temperature of 2°C (36°F), with highs reaching up to 18°C (65°F) and lows dropping to around -13°C (8°F).
JanFebMarAprMayJunJulAugSepOctNovDec313441516270767467574236
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.

December Precipitation in Lewistown

In Lewistown in December, the precipitation amount is 91 mm (3.6 in) over a period of 11 days.

December Precipitation Trends in Lewistown

The chart displays monthly precipitation patterns in Lewistown, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Lewistown, December typically receives around 91 mm (3.6 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec65105941021201011211021291138591
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Lewistown

In Lewistown in December, humidity is 88%. With an average temperature of 2°C (36°F), this humidity feels like a cold, damp blanket wrapping around you, making traveling uncomfortable and energy-draining as every step through the chill seems heavier in the thick air.

December Average Humidity in Lewistown

This chart illustrates the average monthly humidity levels in Lewistown, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Lewistown is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Lewistown

In Lewistown in December, 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 December

The chart shows the monthly maximum UV Index (UVI) for Lewistown in December, 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 December, the maximum UV index in Lewistown typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Lewistown December 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 December 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 December’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 December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)65 mm (2.6 inches)89%moderate
February Weather1°C (34°F)104 mm (4.1 inches)90%moderate
March Weather5°C (41°F)94 mm (3.7 inches)89%high
April Weather11°C (51°F)102 mm (4.0 inches)88%very high
May Weather17°C (62°F)120 mm (4.7 inches)80%very high
June Weather21°C (71°F)101 mm (4.0 inches)79%very high
July Weather24°C (76°F)121 mm (4.8 inches)74%very high
August Weather23°C (74°F)102 mm (4.0 inches)64%very high
September Weather20°C (68°F)129 mm (5.1 inches)67%very high
October Weather14°C (57°F)113 mm (4.5 inches)81%high
November Weather6°C (42°F)85 mm (3.3 inches)89%moderate
December Weather2°C (36°F)91 mm (3.6 inches)88%low

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