condition mean min max 4 h after light 471.8 471.8 471.8 8 h after light 491.9 433.3 550.5 12 h after light 472.65 422.9 522.4 4 h after dark 561.6 541.7 581.5 8 h after dark 512.3 472.0 552.6 12 h after dark 519.2 518.5 519.9