The temps might duck in to the 30's, but 40's is most typical in the summer.

That's a fair assessment, but it doesn't quite cover the extremes. The coldest summer temps tend to happen after several days of cool weather (upper 40s with rain or heavy clouds) followed by a night where skies turn fair and clear. With those conditions you can easily get into the mid 20s at 6000 ft. and above.