AccuWeather has the story ”
If you live in open areas over the suburbs or the countryside from Chicago and Milwaukee to Madison, Wis., and St. Louis and you have tender flowers or vegetable plants, cover them Tuesday evening or risk damage from frost.
Record lows will be challenged Wednesday morning over a large part of the Upper Midwest as an air mass from Canada settles over the region
The average date of the first frost in Chicago occurs during the middle of October but has occurred as early as the middle of September.
Yes, this is just weather! However, it could also be a data point for a continuing trend. Stay Tuned.