condition mean min max 4 h after light 421.4 421.4 421.4 8 h after light 498.1 422.1 574.1 12 h after light 515.1 511.8 518.4 4 h after dark 585.3 403.6 767.0 8 h after dark 674.45 466.8 882.1 12 h after dark 418.35 384.4 452.3