The phrase "average lows" refers to the typical or usual lowest temperatures over a particular period of time, such as a month or year. Full definition
During this month, the average temperature for the island is 19 °C, created by average highs of 23 °C during the daytime and average lows of 16 °C after dark. (holiday-weather.com)
Average low temperatures range from 4 °C / 39 °F to 12 °C / 54 °F. (holiday-weather.com)
In the trials, free radicals were on average lowered by 90 percent within eight days of starting the treatment. (traditionalfoods.org)