The featured plot is of hourly temperatures observed at the Des Moines Airport sensor on December 1 for the past 9 years. This plot provides an interesting look at the different ways temperatures can change over the course of a day. Check out 2002 (orange line), it had the coldest early morning temperature while having the warmest afternoon temperature! Some years (like 2007) the temperature slowly rises the entire day, other years (like 2005) a downward trend occurs, and others (like 2000) not much change occurs at all!

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