While we are burning up down here, the north west is having record cold for the date in some spots, and snow. If this link will work, look at this forcast for the Wind River Mountains of Wyoming! This one was typical, though I found one spot with a forecast low of 14*F and a high of 25*F, plus snow and wind!
Get ready to bundle up, mountain hammock hangers! Don't be fooled just because it is June!