condition mean min max 4 h after light 18.7414 17.8952 19.4051 8 h after light 9.668826666666666 5.39978 12.2248 12 h after light 13.142999999999999 6.8104 19.4666 4 h after dark 51.554 44.6172 55.118 8 h after dark 45.6288 37.6929 53.4913 12 h after dark 24.420833333333334 22.4239 26.6013