condition mean min max 4 h after light 2918.9 2918.9 2918.9 8 h after light 2803.75 2691.8 2915.7 12 h after light 3149.35 3097.5 3201.2 4 h after dark 2682.9 2545.4 2820.4 8 h after dark 2572.5 2482.8 2662.2 12 h after dark 2452.5 2388.0 2517.0