Originally Posted by John Ridley

5 miles north of Chelsea, riding to south of Dexter. Believe it. We have two digital thermometers mounted on opposite sides of the house, from different companies, they're accurate, and they agreed.

There's at least a 5 degree heat island in town (usually 10). It was probably colder than that at some points in my ride; I often see a 5 to 10 degree difference in the low-lying areas. Today it was 38*F when I left, but there was heavy frost on the ground at some points in my ride, including up onto tall grass & corn. That indicates at least 32 and probably 30 or less.