Most U.S. State Maximum Temperatures Occurred Before 1990
A new paper in BAMS evaluated the record of extreme weather in the U.S., state-by-state, going back into data archives and ensuring the same methodology was used through time.
The end result was this table of extremes for each of the 50 states.
Interesting, there is only one 1.5 maximum temperature records that was set in the 2000s -- in South Carolina in 2012, and a tie in South Dakota in 2006 -- and only 4.5 in the 1990s (one was a tie). All others occurred before that, many in the 1930s.