Weather Forecast Accuracy Last Month (December)

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Weather Forecast Accuracy Last Year (2025)

Weather Changeability for Naperville, Illinois

Average change in

Temperature

Average change in high temperature day-to-day

Last Month:

9.3°

Last Year:

6.1°

Average change in low temperature day-to-day

Last Month:

12.6°

Last Year:

8.0°

Average change in

Precipitation

Chance of dry day after a precip day

Last Month:

78%

Last Year:

63%

Chance of precip day after a dry day

Last Month:

33%

Last Year:

23%

ForecastAdvisor Fact

82.0% of Microsoft's low temperature forecasts for Naperville were within 3 degrees of actual temperatures last year.

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