I don't know whether to call it a corner case or not, but I was pretty easily able to find this one (based on my own experience – the peak temperature in the East Bay has always felt very late in the year): https://weatherspark.com/compare/y/541~3268/Comparison-of-th...
I played around with weatherspark and all the places I tried looked like this :
https://weatherspark.com/compare/y/1705~8813/Comparison-of-t...