Extremely warm air aloft was able to mix down to the surface yesterday and drove temperatures to record levels. The century mark was breached over northwestern Iowa with Sioux City topping out at 106! It certainly felt like summer. For Des Moines, the high was 94. Has summer already started? The featured chart presents the percentage of daily high temperature reports that occurred within the warmest 91 day period of the year or during meteorological summer (Jun, Jul, Aug). When Des Moines experiences a 94 degree high, ~95% of the time this day was also within the 91 warmest days of the year. So perhaps we have gone from snow to summer within two weeks.

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Tags:   summer