The mountain summit weather reporting station at Mt. Leconte in the Great Smoky Mountain National Park has been showing some really cool temperatures this late spring and summer.
Yesterday, the last day of June 2008, LeConte Lodge at 6400 ft. reported a high of only 54 degrees F. and a morning low of 40 F. On June 19th and 20th, LeConte reported a wintry overnight low of 35 degrees F. By contrast, on the same day, the low temperature at Cades Cove was 50 F. at 1600 ft. with a daytime high of 80.
Some people say they don't hike in the summer because it's too hot... never in the Smokies, especially at altitude.
I mention the LeConte temperature because it is reported here on the NWS page on a regular basis. Personally, I would never hike LeConte in any month except Jan or Feb. Simply too many people. (I dare say say LeConte lodge is "the slum of the Smokies" - I heard there was a rat problem there).
For a real wilderness experience, there IS only ONE WAY to visit the Smokies in summer, the most beautiful way: by boat.