It is always a nervous time of year in Iowa with tender vegetation emerging from the ground and still some climatological risks of freezing temperatures. The featured chart presents the computed percentile of having the last day below 32 degrees on or prior to 11 May. For example, a value of 85 would indicate that 15% of previous years on record had a sub 32 temperature after 11 May. So for much of the state, the risks are rather low by this date, but there are some areas prone to cold events with significant frequencies yet. The good news is that the forecast over the next 7-10 days continues to remain warm, so it would seem we can make it out of spring without any more widespread freeze events.

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