Lake Michigan's cold water is holding Chicago temps 10–15°F below normal Monday, with wind chills in the upper 40s and gusts to 30 mph. Then a dramatic swing Tuesday sends highs near 74°F — but thunderstorms and 40 mph gusts threaten the afternoon commute.
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A strong lake breeze off Lake Michigan is keeping Chicago well below where mid-May temperatures should be, and it's the main thing shaping your day right now. Skies are mostly clear, which is a little misleading.
The high today tops out in the upper fifties. That's ten to fifteen degrees below normal for this point in May.
The signal to watch is Tuesday. The pattern shifts significantly, and it does so quickly.
The important distinction for Tuesday is the timing. Mornings look fine.
Wednesday is the recovery day. Mostly sunny skies return, highs near sixty-two degrees, breezy but manageable.
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