I live in Central Arkansas, which normally has hot summers. It looks like July was actually a little cooler for us this year. http://www.worldclimate.com/climate/us/arkansas/little-rock https://www.accuweather.com/en/us/little-rock-ar/72201/july-...
We have to make it easy to grasp so we come up with things like “Global warming” or “climate change” for the general public. Which maybe indicates that the change is in a particular direction.
But the climate is a system that can be influenced by many factors. I think what you should be worried about is repeated unseasonal weather. Too cool may be just as bad as too hot.