condition mean min max 4 h after light 18.4997095 17.23809 19.761329 8 h after light 16.147923 15.057756 17.23809 12 h after light 15.3776585 14.021971 16.733346 4 h after dark 16.57562 15.83763 17.31361 8 h after dark 16.74114 15.925235 17.557045 12 h after dark 15.78909 15.78909 15.78909