Yesterday's IEM feature noted the number of days this year in the 70s being 50% higher than average. Today's featured plot looks at the number of days with a high temperature of 70+ for the spring months of March, April and May for Des Moines. A simple trend line is fit to the data along with the long term mean. Plenty of variability makes the trend line not significant, but the majority of recent years have seen above long term average number of days. The highest value on the chart was the epic spring warmth of 2012.

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