condition mean min max 4 h after light 968.6 968.6 968.6 8 h after light 970.45 851.9 1089.0 12 h after light 732.3 526.6 938.0 4 h after dark 564.2 528.0 600.4 8 h after dark 632.8 559.1 706.5 12 h after dark 1033.95 813.9 1254.0