condition mean min max 4 h after light 3220.7 3220.7 3220.7 8 h after light 3349.1 3277.1 3421.1 12 h after light 3542.2 3416.0 3668.4 4 h after dark 2983.45 2427.5 3539.4 8 h after dark 2755.1 2134.0 3376.2 12 h after dark 2558.8 2381.6 2736.0