condition mean min max 4 h after light 1912.9 1912.9 1912.9 8 h after light 2502.2 2348.7 2655.7 12 h after light 2573.55 1885.5 3261.6 4 h after dark 2205.4 1543.3 2867.5 8 h after dark 2103.3 1753.5 2453.1 12 h after dark 2232.2 1982.7 2481.7