The last significantly cold autumn was 1993. The way the last 3 years have gone with the coldest winter for CET since 1978-79, coldest spring since Victorian times and the coolest summer for over 20 years, it feels like we are due a notably cold autumn, a sub 9C CET autumn. Both autumns 2010 and 2012 were the coolest since 1993 but their CET values were not particularly notable.