Illinois State Water Survey Illinois State Climatologist

More on Soil Temperatures in Illinois

Published by Jim Angel

Here are the average dates in fall when the 4-inch soil temperature falls below 50 degrees (left panel) and below 60 degrees (right panel). Consider these as a “rule of thumb” for planning purposes. Consult the current soil temperatures, as discussed in the earlier post, for decisions on applying nitrogen in the fall.
 

Average date when 4-inch soil temperature drops below 50 and 60 degrees.
Average date in fall when the 4-inch soil temperature drops a) below 50 degrees, and b) below 60 degrees.