condition mean min max 4 h after light 37.1783 33.9919 40.3647 8 h after light 31.717 26.0845 37.3495 12 h after light 33.4047 29.9928 36.8166 4 h after dark 54.43216666666667 51.8702 55.7267 8 h after dark 67.9409 63.7016 71.9316 12 h after dark 51.3053 47.21 55.7826