condition mean min max 3 h after light 18.3608 17.0294 20.1019 6 h after light 17.4519 14.5915 19.7578 9 h after light 17.0716 15.9171 17.9792 12 h after light 17.8188 16.5219 18.7822 3 h after dark 23.5094 22.8639 24.4033 6 h after dark 23.101966666666666 21.7703 24.9674 9 h after dark 20.8355 19.0834 22.1548 12 h after dark 19.821733333333334 18.2499 20.8191