The old saying goes that if you set your expectations low, it is difficult to be disappointed. The same can sort of be applied to growing degree days (GDD) as illustrated by the featured chart. The chart presents the daily GDD departures from average for Ames. During March and early April, not much is expected for GDDs as the climatological accumulation is very low. But now that we are to the end of April, expectations are much higher and so daily disappointments can be of larger magnitude! The increase in more negative blue bars is evident and only one positive departure day over the past 12 days or so.

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