How to Hike Chasm Lake Helpful Tips Hiking Stats PhotosWeather on Longs Summit can be changeable. The atop Longs Mountain might vary dramatically. It can be crucial to check the weather forecast and be equipped for any climate conditions hiking on Longs Summit. The is noted for its sudden weather shifts as well as hazardous weather events. Wearing the right clothes in layers and bringing extra equipment like rain jackets, hats, and mittens is crucial to be protected from the elements.