Surely whether patterns have changed from 20/30 years ago.
Thirty years ago we had roughly five months with the heater on, one month off, fivr months with the air conditioner on, and one month off. Now it is. 4-1-6-1, and the heating season has many days where the heater never comes on.
The elms in my collection starting leaving out January 6, and everything had leaves budding out end of February, about a month earlier than used to be.
Yes, patterns have changed.