October 29 Update: The morning low was 28° at Minneapolis and 31° at Chicago.
Original post:
At 10 pm EDT tonight, the official Minneapolis temperature reached 32° for the first time this season. This ends the string of freeze-free days at 22 past the average date of October 6 and ties for the 10th latest date of first frost. October so far is averaging 6.4° above the climatological mean.
Chicago has still not yet reached 32°, although a low of 31° is forecast by morning.
Image (click to enlarge): Temperature, dewpoint, relative humidity, and precipitation at Minneapolis for the week ending October 28, 2010, from National Weather Service
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