For my weather pages.
May 2018 (80.37°F) was the warmest May in recorded history in this area, surpassing May of 2012 by half a degree. The nine-year HLA average for May is 76.72°F.
(Note: May's trend lines cross through October dots on three occasions. October 2014, 2015, and 2016 were far warmer than average, and so were close to May's cooler-than-average temps. If the white dot is on a downslope, it's an October; if it's on an upslope, it's a May.)