A typical example of this is at Indiana University in Bloomington, where the frequency of hot days plummeted after 1955.
From 1910 to 1955 they averaged 32.5 days over 90F per year, with a peak of 70 days in 1913.
The summer of 1913 also brought California the hottest weather ever recorded on Earth.
But since 1955, Bloomington averages less than half as many 90 degree days, as they did from 1910 to 1955.
If NOAA had actual scientists working on climate, they would want to understand this cooling, rather than just trying to hide it.