Yesterday's feature looked at the warmest spots in the state and today's feature shows the favored spots in the state with the lowest daily minimum temperature. This plot nicely shows some topographic effects that even occur in a flat state like Iowa. Northeast Iowa is the relatively cool, but the observation sites in the Mississippi River valley are sheltered some by the warm water during the fall season. Northwest Iowa is another location and it extends down into westcentral Iowa along the Nishnabotna Valley.

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