(Des Moines, IA) — Iowa State Climatologist Justin Glisan (Glisten) says frost has been a rare occurrence so for this fall. Frost happens when temperatures get down to 32 degrees and the killing frost that ends the growing season happens at 28 degrees. Glisan says some cities have been reporting overnight lows that are typically daytimes highs and we are running about nine degrees above average for the first 15 days of the month. Those warm temperatures have kept the frost away longer than usual and that may not change for a while.
