The featured chart looks at the largest and smallest temperature range for a month based on all COOP observations in Iowa for a given year compared to what was observed in 2009. The months of September, October, and November had an exceptionally small amount of temperature range with November unofficially being the smallest on record. The smallest number on this chart is 44, which means that for any given month, we Iowans will probably experience a 44 degree difference between the warmest high and coldest low temperature.

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Tags:   climate   2009