"what are your minimum winter temperatures in SW washington? Peter (UK)" I've been at this place since 2007, and I believe the lowest temp was 12F (-11C). We have had five-day cold spells where the temp has hovered around 20F (-7C) for a few days, usually with snow cover. My property gets much colder than most of the heavily populated areas in the Pacific Northwest, because it is at 600 feet and on the north side of a hill.