Weather Forecast Accuracy Last Month (December)

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Weather Forecast Accuracy Last Year (2025)

Weather Changeability for Lewistown, Montana

Average change in

Temperature

Average change in high temperature day-to-day

Last Month:

8.2°

Last Year:

7.4°

Average change in low temperature day-to-day

Last Month:

14.3°

Last Year:

7.8°

Average change in

Precipitation

Chance of dry day after a precip day

Last Month:

31%

Last Year:

55%

Chance of precip day after a dry day

Last Month:

24%

Last Year:

18%

ForecastAdvisor Fact

5.6% of The Weather Channel's low temperature forecasts for Lewistown were exactly right last month.

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