condition mean min max 4 h after light 10.294212 9.766399 10.822025 8 h after light 8.902445 8.038491 9.766399 12 h after light 9.5910875 9.415776 9.766399 4 h after dark 8.5764885 8.084902 9.068075 8 h after dark 9.21773 8.669061 9.766399 12 h after dark 24.428674 24.428674 24.428674