The featured chart displays the average high and low temperature by month for Des Moines partitioned by the presence of snow cover. Placing aside some timing aspects of how the snow depth is reported along with max and min temperatures, the chart shows a clear difference in averages between snow and non-snow covered condition. The presence of snow changes the game for how heat is lost during the night time and what happens to the inbound heating by the sun during the day. Having said all this and even without the presence of snow, today's temperatures will be remarkably cold.

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