All time record minimum temperatures in the US peaked around 1990. There have been three reported so far this year, though the data from NOAA to date is not complete yet.
All-time record maximums peaked in the 1930s.
Daily record maximums also peaked in the 1930s.
Daily record minimums peaked around 1990.
via The Deplorable Climate Science Blog
February 2, 2019 at 08:32AM
Iowa Climate Science Education 