Weather Forecast Accuracy Last Month (December)

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Weather Forecast Accuracy Last Year (2025)

Weather Changeability for Union, Washington

Average change in

Temperature

Average change in high temperature day-to-day

Last Month:

4.4°

Last Year:

4.7°

Average change in low temperature day-to-day

Last Month:

4.0°

Last Year:

5.4°

Average change in

Precipitation

Chance of dry day after a precip day

Last Month:

13%

Last Year:

28%

Chance of precip day after a dry day

Last Month:

43%

Last Year:

20%

ForecastAdvisor Fact

On average, Wetter.com's low temperature forecasts for Union were off by 4.37 degrees last year.

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