Originally Posted By: Dan S.
Keep in mind that June is a little early for stable weather around the mountain.


Yep.

Even up thru early June I've ran into snowfall camping in the Cascades.

You have to keep in mind elevation & freezing levels. At 5000 feet, a lil rain down below will be snow up above.

A safe gauge is -10ºF for every 1k feet especially when the sun drops.

So if it's 80º in Seattle and you're camped at 4000ft expect temps to run about 40º-50ºF.

Now that's not any sort of law, it's just an insurance policy so you don't get caught in shorts when the temps drop below freezing.