The two years 2010 and 1983 have a lot in common so far, at least at Ames, Iowa. I haven’t analyzed other locations, but Ames was not typical of the region either year. This year the growing degree day (GDD) accumulation has climbed from normal in mid-May to about 100 GDD above normal at the last week of June. In 1983 the GDD accumulation was about 200 GDD behind usual by mid-June then it rapidly increased to slightly above normal by mid-August.