condition mean min max 4 h after light 305.5 305.5 305.5 8 h after light 293.3 275.0 311.6 12 h after light 371.85 354.7 389.0 4 h after dark 493.0 424.0 562.0 8 h after dark 575.25 550.2 600.3 12 h after dark 499.45 498.4 500.5