Weather Forecast Accuracy Last Month (December)

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Weather Forecast Accuracy Last Year (2025)

Weather Changeability for Seattle, Washington

Average change in

Temperature

Average change in high temperature day-to-day

Last Month:

3.1°

Last Year:

4.1°

Average change in low temperature day-to-day

Last Month:

3.5°

Last Year:

3.5°

Average change in

Precipitation

Chance of dry day after a precip day

Last Month:

25%

Last Year:

41%

Chance of precip day after a dry day

Last Month:

50%

Last Year:

22%

ForecastAdvisor Fact

It rained or snowed 78% of the time in Seattle last year when Microsoft's text forecasts called for precipitation, and 6% of the time when they did not.

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