condition mean min max 4 h after light 15.14275 14.1524 16.1331 8 h after light 14.58385 14.2036 14.9641 12 h after light 16.074199999999998 15.1004 17.048 4 h after dark 17.8719 16.84 18.9038 8 h after dark 17.76995 17.6855 17.8544 12 h after dark 18.034 17.0244 19.0436