On average, the Cold Degree Days are achieved earlier in Stark County by 3 days.

I am not so sure how important it is when TP die. It's more important to know the climate favorable for growth. That goes from 68F to 68F. The hotter the better for them. A body should probably start harvesting when temps fall below 72F in late summer/early fall when they are feeding more and brooding (and brooding success) is falling off. For Stark County this is the first half of September.

It isn't what we don't know that gives us trouble, it's what we know that ain't so - Will Rogers