September's HLA, 2010-7
For my weather pages.
September 2015 was the warmest September in history for this area, barely surpassing Sept. 2011. I don't know when the coolest was. Sept. 2017 was the coolest of the eight years we've lived here, barely dropping below 2012's mark.
Interestingly, September experiences the least variation of any month in average temperature.