I'm planning to camp one night in Custer, SD, so I started looking at weather forecasts along the route.
Here's what I found for Friday's high temperature (degrees F):
Nashville, TN - 92
Kansas City, MO - 88
Custer, SD - 43 (plus rain and 14 mph wind)
Fairbanks, AK - 66
Alaskans have to dig out their heavy clothes just to come to Mt. Rushmore!