Unfinished 100 Miles of Hills!

Was it the heat, the humidy, the hills, the lack of training, or all of the above? Bottom line is 100 miles of Hills has yet to be completed. I can say I am not acclimated to heat, let alone hills, and barely made it home with 73 miles under my belt. This year we didnt even make it as far as the Reis Road Climb.