condition mean min max 4 h after light 993.8 993.8 993.8 8 h after light 989.0 961.4 1016.6 12 h after light 845.65 830.9 860.4 4 h after dark 924.85 779.8 1069.9 8 h after dark 1031.15 954.7 1107.6 12 h after dark 1085.1 1076.2 1094.0