condition mean min max 4 h after light 1096.0 1096.0 1096.0 8 h after light 970.85 878.0 1063.7 12 h after light 989.05 893.5 1084.6 4 h after dark 906.95 820.0 993.9 8 h after dark 903.05 835.4 970.7 12 h after dark 755.6 683.0 828.2