Wallhack, If you go to www.grandfather.com you can find out all you need to know. They have a weather database at that site. It is in Avery County, NC. I can see Grandfather Mountain from my favorite primitive site in Burke County. It is on the road to Table Rock, just across from Hawksbill Mtn. I've hiked Table Rock, Hawksbill, and Sitting Bear. They are all great hikes.
Just south of the parking lot at Grandfather there is Blackrock Trail. It's rough - I had swollen ankles for four days. It was like a dry creekbed with nothing but rocks. Got some great pics though.