Oh I knew what you meant...but the article mentioned snowfall which over the last 30 years, has increased.
I do think the overall high temps have increased, but I think you are right WRT the mins.
Warmer summers have been brought to us by dews and its effect on night lows I think.
Part of that is likely due to warmer waters off the east coast. But it’s also been a favorable pattern over the last several summers to bring the warmth and humidity up the coast.