condition mean min max 4 h after light 640.7 640.7 640.7 8 h after light 598.45 553.6 643.3 12 h after light 484.95 459.4 510.5 4 h after dark 590.4 487.7 693.1 8 h after dark 833.2 782.3 884.1 12 h after dark 714.8 640.8 788.8