Generally, you can count on a week or two in the 80s and 90s. I've seen 100, but it's rare. AC in homes is rare, too. :-)
85 is hot, when there's no AC, and you're used to 60s and 70s.
Thanks. Hawaiians don parkas when it drops to 70.
It really does depend on what you're used to.
If I were to visit one place in Maine, where would you recommend?