WEATHER You should arrive prepared for a wide variety of weather conditions. Summer temperatures vary from 45'F to 85'F, spring and fall temperatures from 30'F to 70'F. You may encounter rain and fog at any time, but we assure you that the sun does shine! Blackflies are most common during late May and early June. Winter temperatures vary from mid-30's F to below zero. Average annual snowfall is 60 inches.