There are valleys in the Wenatchee Mountains that get hard frosts in August with day time temps still making it into the low 80s or so. A guy that owned a store in Liberty in the 1980s told me he recorded a low of 24 in August one of the years I was over there.
The official fire danger was still low when I was in Cle Elum last weekend. Can't remember ever seeing it low this late in the season. People are sure nervous after the last few years. This year is a way different situation.