Childhood memories are not scientific fact.

I grew up in Upstate NY. There were plenty of warm winters in the '70s and '80s. I don't think anything is remarkably different.

Also, we had some summers that were freezing--like you never wanted to go swimming the whole summer except maybe one week in August. Other summers were blazing. My parents' old farmhouse didn't have A/C. They still don't have A/C now.