condition mean min max 4 h after light 8714.7 8714.7 8714.7 8 h after light 7886.1 6751.8 9020.4 12 h after light 6915.0 6498.1 7331.9 4 h after dark 6027.35 5810.8 6243.9 8 h after dark 7447.6 6685.7 8209.5 12 h after dark 10821.6 8977.7 12665.5