condition mean min max 4 h after light 23.39205 23.2388 23.5453 8 h after light 21.5032 20.8913 22.1151 12 h after light 23.69775 23.5199 23.8756 4 h after dark 29.5282 26.6545 32.4019 8 h after dark 23.3599 23.0228 23.697 12 h after dark 27.15295 26.1397 28.1662