By Meteorologist Tom Skilling
Chicago temperatures this meteorological spring—the three month period from March 1 to May 31—have extended this past winter’s trend of cooler than normal temperatures. With the season more than half over, 60% of its days have posted temperature deficits.
The one way spring differs from this past winter is that it’s been dry.
The season ranks driest of any spring to date over the past 17 years! Its 2.99” observed precipitation (this includes rain and melted snow) is just 60% normal and down nearly 2 inches.
It’s a trend not limited to Chicago’s official observation station at O’Hare. Our analysis of precip tallies at Chicago area observation sites shows the same trend.
Surging temps Thursday and Friday belie the chill and strengthening winds due to take up residence over the coming weekend and spill over into next week
The chilly temperatures which dominated Wednesday are to ease Thursday—and even more so Friday—as the current easterly wind regime off Lake Michigan gives way to more southerly Thursday afternoon and evening winds. That southerly flow is to transport Gulf moisture into the area providing fuel for shower and thunderstorm development Thursday afternoon into Thursday night.