Low temperatures on Saturday are forecast to start off chilly in the 30s, but then recover into the mid 70s. Is this common for April? The featured chart attempts to address that by looking at hourly temperature distributions on days with a high temperature of at least 75 degrees for Ames. The distributions are shown by box and whisker plots showing the inter-quartile range box and whiskers out two sigma. For these days, the overnight temperatures are typically in the upper 40s or lower 50s. The forecast situation on Saturday is not too rare though as plenty of events are indicated by the chart.

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