Just noticed that the OP is in Washington state where it really doesn't get very cold in the winter. Average low temps in Dec/Jan/Feb range from 28 - 30 degrees above zero. Average highs temps for the same period range from 38 - 48 degrees.
In comparison - the average low temps in the same months in my home town range from 5 below - 2 degrees above zero. The average highs in those months range from 16 - 24 degrees.
In that moderate climate - you could easily run a 5 or 10WSomething year round with no issues.
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