Looking at temperatures for the past hundred plus years the number of 100 degree days recorded annually across the entire US has dropped from 5% in 1936 to about 1%. That’s a decline in average warmth.
In order for there to be warming you’d want to have more warmer days not fewer.
No, ninety degree days didn’t fare any better.
But, don’t forget! Cold January-March Is Weather. Warm December Is Climate.