condition mean min max 4 h after light 997.5 997.5 997.5 8 h after light 923.95 838.0 1009.9 12 h after light 1032.45 998.2 1066.7 4 h after dark 973.0 902.7 1043.3 8 h after dark 1222.15 1117.6 1326.7 12 h after dark 1089.5500000000002 1055.2 1123.9