Best weather day was Sept 26,92. This was the day that I hiked up Mt. Washington to be married on the summit. I hiked up in shorts and no shirt the weather was so nice. 9 other people hiked up with me and we all enjoyed the awesome weather!!!!!!!!!! The wedding on the summit was incredible. I have also climbed in the winter and what a difference. The weather variable is what makes Mount Washington so incredible!!!!!!!!!!!!