The featured chart looks into spring season periods with four inch depth soil temperatures around 50 degrees. For each year on record for the Ames Ag Farm Ag Climate / Soil Moisture site, the first period lasting at least 48 hours with the soil temperature above 50°F is colored red, then any subsequent periods below 50°F are colored light blue. If those periods last more than 24 hours, they are colored dark blue. For this year, there was only a brief period toward the end of April with such chilly soil temperatures. The entire month of May has seen temperatures above 50°F at a four inch depth.

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