We booked a week in July through RCI. The weather was perfect, bits of rain but it did not change any of our plans. The Inn was clean, all of the people were very friendly and helpful. I did use the pool a couple of times and it was great. I am used to swimming in Lake Huron, so the temperature was fine. The area is beautiful for hiking and sightseeing. This was our second trip to the area and we found new things to do.
July is a perfect time to visit. Take the train trip, do the drive up Mount Washington, hike as much as you can and remember your sun screen and bug repellent.