condition mean min max 4 h after light 15.7074 14.2077 17.2071 8 h after light 12.72065 12.4028 13.0385 12 h after light 12.7589 12.086 13.4318 4 h after dark 17.3823 15.3144 19.4502 8 h after dark 16.3373 16.1315 16.5431 12 h after dark 16.76895 15.1208 18.4171