Summer time heat is forecast for later in this week with a number of locations in the state experiencing their first 90+ degree high temperature of the year. The featured chart presents the average period between the year's last and first occurrence of a given high temperature threshold for Des Moines. For the 90 degree threshold, the average period is indicated between the first week of September and about the second week of June, so this year will be right on schedule if the forecast verifies. The increase in heat and humidity will also bring chances of thunderstorms and severe weather. But for Monday, a very pleasant day of weather is expected.

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