Untersuchungen haben ergeben, dass in Gebieten im Nordosten der USA in den letzten viereinhalb Jahrzehnten die Temperaturen unter dem Gefrierpunkt fast 1,5 Wochen lang gesunken sind, während in Teilen einiger Staaten am Golf und im Südwesten die Temperaturen, die Hitzestress verursachen, fast 1,5 Wochen lang gestiegen sind

Studying historical hourly weather data – and the amount of time that temperatures remain above or below certain thresholds – reveals several impacts of U.S. regional climate change trends. In a new study, researchers from North Carolina State University found that over the past four and a half decades, areas in the northeastern U.S. have lost almost 1 1/2 weeks of temperatures below freezing, while portions of some states in the Gulf and Southwest have gained almost 1 1/2 weeks of temperatures that cause heat stress. The data can be used to inform climate adaptation planning.

“One of the challenges when talking about and planning for climate change is that the average change seems too small to be significant,” says Sandra Yuter, Distinguished Professor of Marine, Earth and Atmospheric Sciences at NC State and corresponding author of the study. “Two or three degrees doesn’t make much difference if your average daily temperature is 65 degrees Fahrenheit. But it can make a huge difference if your typical temperature was 30 F and that increases to 33 F.”

https://journals.plos.org/climate/article?id=10.1371/journal.pclm.0000736

That tracks nicely with the effects of cleaning the air of particulates which cooled the earth.