condition mean min max 4 h after light 917.2 917.2 917.2 8 h after light 1170.65 1029.0 1312.3 12 h after light 1132.0 961.8 1302.2 4 h after dark 1276.85 1090.6 1463.1 8 h after dark 1665.75 1478.2 1853.3 12 h after dark 1530.25 1144.3 1916.2