The featured map presents an IEM analysis of average first fall date with a low temperature below 32 degrees Fahrenheit based on long term climate sites. The 'X' marks on the plot denote locations that have had such a cold temperature so far this fall season. The map shows average dates in Iowa ranging from 27 September to 17 October. The map nicely shows some climatological features of our region with the earliest dates found over the high plains and northern tier of states. The warmth effects of the Great Lakes is noticeable as well with dates coming later the closer you get to the water. Our first chances of a freeze look to arrive once the calendar nears October with an end to our current stretch of warm weather.

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Tags:   freeze