Interesting comments to this post on So Carolina citrus and C vs F temp data analysis.
Hillsboro, Ohio hasn’t had a 100 degree day in over 60 years, but prior to 1960 they were fairly common. In 1895, they had ten 100 degree days, including eight in September. On this date in 1895, it was 104 degrees – twenty five degrees warmer than today’s forecast maximum.
ftp://ftp.ncdc.noaa.gov/pub/data/ghcn/daily/hcn/USC00333758.dly
Climate Collections 