Temperatures Tuesday morning started off very chilly in the single digits over northern Iowa and also started a wild swing of temperatures forecast over the coming days with highs on Wednesday pushing 50 degrees and then crashing back down to below freezing by Friday. The featured chart presents the weekly frequency of having an hourly temperature within a given range of temperatures for Des Moines. The chart nicely shows that the most extreme cold temperatures (below 0F) are mostly gone by mid March and we slowly start to see an increasing frequency of warmer temperatures in the 70s. If you imagine lines between the different thresholds, the steepness of them provides some hope that warmer spring temperatures are not far off!

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