condition mean min max 4 h after light 8.263385 7.85572 8.67105 8 h after light 8.123365 8.022 8.22473 12 h after light 9.6475 8.5944 10.7006 4 h after dark 20.617849999999997 20.2991 20.9366 8 h after dark 16.69695 16.0216 17.3723 12 h after dark 14.84685 14.1998 15.4939