The featured chart presents the progression of temperature and precipitation departures, expressed in sigma terms, since the beginning of February for Ames. For every seventh day, the trailing fourteen day departure is plotted. The chart is physically bounded, so the fourteen day window of averaging tends to yield a cyclical pattern. The most two recent points on the plot show the trend to colder departures. The recent few days of warmer weather have helped somewhat to dampen that trend, but for the fourteen day window the departure is still over 1 standard deviation from average.

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