Weather Forecast Accuracy Last Month (December)

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Weather Forecast Accuracy Last Year (2025)

Weather Changeability for Helena, Montana

Average change in

Temperature

Average change in high temperature day-to-day

Last Month:

7.8°

Last Year:

6.4°

Average change in low temperature day-to-day

Last Month:

11.7°

Last Year:

6.3°

Average change in

Precipitation

Chance of dry day after a precip day

Last Month:

60%

Last Year:

54%

Chance of precip day after a dry day

Last Month:

50%

Last Year:

22%

ForecastAdvisor Fact

16.0% of Microsoft's low temperature forecasts for Helena were exactly right last year.

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