Iowa: soil temperature seems to be about 3 weeks behind normal

Corn Emergence Problems Across Iowa

...current soil temperatures have recovered to near 60 degrees F at the 4-inch depth and will likely continue warming.

This is suitable for corn and soybean planting and growth this time of year. Mid-Iowa soil temperatures seldom fall below 50 degrees F after the first of May. This year soil temperature seems to be about 3 weeks behind normal. Both corn and soybean grow best at a soil temperature near 80 degrees F.