condition mean min max 4 h after light 915.4 915.4 915.4 8 h after light 1085.15 1059.9 1110.4 12 h after light 1297.85 1252.4 1343.3 4 h after dark 1564.65 1397.5 1731.8 8 h after dark 2129.95 2051.1 2208.8 12 h after dark 1657.8 1391.3 1924.3