Considering parts of the Cascades saw 10x more precipitation than it was supposed to... More of it rain than snow
There must be a lot of burnable vegetation getting ready up there.
Seattle’s and its surrounding areas average first frost date doesn’t happen until around Thanksgiving. There are locale exceptions for late October, where most are in Eastern WA. What winter are you talking about that starts in October? Seattle doesn’t even make the list for average snowfall by month for October.