condition mean min max 4 h after light 1058.6 1058.6 1058.6 8 h after light 1031.6 914.3 1148.9 12 h after light 1239.4 1053.2 1425.6 4 h after dark 1648.0 1554.0 1742.0 8 h after dark 1613.9 1273.1 1954.7 12 h after dark 1573.8 1498.5 1649.1