Two of the more notable weather trends in the U.S. since the latter part of 2019 were above-normal temperatures from December through March and wetter than normal conditions from October through March in the central and eastern U.S. 

In Iowa, the December through March period ranked as the 11th warmest since 1895, while the October through March period was the 14th wettest.

That changed in April, which brought wide variability in Iowa’s weather with some daily average temperatures more than 20 degrees above normal on the warmest days and...