Weather Forecast Accuracy Last Month (December)

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Weather Forecast Accuracy Last Year (2025)

Weather Changeability for Lerna, Illinois

Average change in

Temperature

Average change in high temperature day-to-day

Last Month:

8.5°

Last Year:

5.7°

Average change in low temperature day-to-day

Last Month:

12.1°

Last Year:

7.8°

Average change in

Precipitation

Chance of dry day after a precip day

Last Month:

50%

Last Year:

60%

Chance of precip day after a dry day

Last Month:

15%

Last Year:

22%

ForecastAdvisor Fact

9.4% of World Weather Online's high temperature forecasts for Lerna were exactly right last year.

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