condition mean min max 4 h after light 8.277017 7.107847 9.446187 8 h after light 8.408082 8.358235 8.457929 12 h after light 8.132554500000001 7.906874 8.358235 4 h after dark 8.863559 8.358235 9.368883 8 h after dark 9.20234 8.815425 9.589255 12 h after dark 7.821965 7.821965 7.821965