Temperatures for Halloween will be a horrible trick and definitely not a treat with highs in the 30s and lows in the 20s. The featured chart presents October 31rst high temperatures for Des Moines and there's not many years shown with a high in the 30s. The major caveat with running this chart for other locations is that they often are not summarizing calendar day totals, but a 24 hour value ending at roughly 7 AM. For Des Moines, this data is for the calendar day.

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