In the US, the frequency of 95F (35C) days has dropped sharply since the 1930’s.
There is some correlation between the frequency of 95 degree days, and the average annual maximum temperature.
There is good correlation between the frequency of hot days and the average summer maximum temperature.
Not surprisingly, the frequency of 95 degree days correlates very well with the frequency of 90 degrees days.
There is perfect correlation between the frequency of 95 degree days, and the frequency of 95 degree days.
However, there is no correlation between the frequency of hot days and atmospheric CO2. If anything, there is anti-correlation.
So which one do climate scientists latch on to? The only relationship which shows anti-correlation. Climate science is a 100% fact-free venture, and the biggest clown show on Earth.