condition mean min max 4 h after light 1390.4 1390.4 1390.4 8 h after light 1231.8 1209.6 1254.0 12 h after light 1346.75 1266.5 1427.0 4 h after dark 1281.35 1274.5 1288.2 8 h after dark 1167.3000000000002 1115.9 1218.7 12 h after dark 1041.4 982.1 1100.7