While we have seen brief periods with very hot weather, much of this summer has been quite comfortable with yesterday being another such day with highs generally in the 70s. One quantitative measure of how much hot weather there has been can be found with Stress Degree Days (SDD)s. The common equation to compute this value is to sum the difference from 86°F any days with a high above above that threshold. For example, a day with a high of 88°F would accumulate two units whereas a day with a high of 78°F would accumulate zero. The featured chart computes ranks for accumulated SDDs by climate district for the summer to date. A rank of one would indicate the largest SDD accumulation on record being this year and a rank of 132 being the smallest since 1893. The map of unofficial IEM estimates indicates very little SDD concerns over nearly all of the corn belt with values just or well below average.

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Tags:   sdd