Back from my week-long camping trip to east of the Cascades. Most of it was spent just east of Mt. Rainier near Cliffdell. Surprisingly mild nights there. Didn't have a thermometer with me but I doubt it got much cooler than 50˚F.
Definitely got well into the 40's last night in the mountains above Keremeos, BC. Only night I had to break out the extra bedding.