condition mean min max 4 h after light 1103.8 1103.8 1103.8 8 h after light 1167.85 1104.1 1231.6 12 h after light 1234.3 1179.8 1288.8 4 h after dark 1131.65 1009.0 1254.3 8 h after dark 1133.65 1099.3 1168.0 12 h after dark 968.6 916.1 1021.1