Very Small Patches of Frost this Morning in Arlington Heights

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Very small patches of frost reported this morning in Arlington Heights. Less than one-square foot patches of frost observed on the grass away from buildings. The official low at O’Hare was 40°F at 6:51 a.m. CDT Tuesday. Most recording stations are about 2 meters above ground. The temperature is lower at ground level. More stations reported below …
Chicago Executive Airport … 37°F at 4:52 a.m. CDT
Aurora Municipal Airport … 32°F at 2:52 and 3:52 am. CDT
West Chicago DuPage Airport … 36°F at 3:52 through 5:52 a.m. CDT
Rockford International Airport … 37°F at 2:54 through 5:54 a.m. CDT

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