condition mean min max 4 h after light 578.8 578.8 578.8 8 h after light 537.0 532.4 541.6 12 h after light 879.3 846.5 912.1 4 h after dark 2419.5 1036.2 3802.8 8 h after dark 1851.9 1712.8 1991.0 12 h after dark 1249.2 1133.2 1365.2