I've been keeping track of the weather. Dots on this graph represent monthly HLAs (average of daily highs and lows).
The green line connects only the Octobers, 2010 through 2017. The graph shows a very slight cooling trend over four years, then a sharp jump for October 2014; October 2015 tied the previous year -- exactly. October 2016 barely increased over the previous two.
Octobers 2014-16 were the three warmest Octobers I've ever lived through.
Then 2017 saw a sharp drop back to previous levels.