Weather fluctuationsâ affect on apple growers still to be determined While itâs still early in their seasons, two U.S. apple-growing regions have been contending with significant temperature shifts. Michigan recently saw two cold mornings with temperatures getting down to about 26 degrees Fahrenheit for about three hours. âThe bud development on apples is still pretty tight so the damage doesnât appear to be severe. But time will tell,â says Ken Korson, apple commodity manager for North Bay Produce Inc. based in Traverse City, MI. âBut itâs way too early to tell what size of crop weâre going to have.â