condition mean min max 4 h after light 22.1042 21.6808 22.5276 8 h after light 16.13655 15.5359 16.7372 12 h after light 19.06945 16.3936 21.7453 4 h after dark 31.15925 28.354 33.9645 8 h after dark 31.5475 30.5838 32.5112 12 h after dark 31.20445 30.3715 32.0374