On average how many days a year does it rain in Washington state? And how many inches a year?

WA's average yearly rainfall is 27.66 in. In Seattle, the average yearly rainfall is 36.2 in, 150 days per year with more than 0.1 mm (0.004 in) of rainfall.

Thursday, February 02 2012

Source: http://www.betweenwaters.com/etc/usrain.html

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