Three-Month Temperature Outlook
Issued: September 2017

CHICAGO OHARE INTL AP, IL
COOK County, Coop ID: 111549 Elevation: 658 ft. Latitude: 41° 59' N Longitude: 87° 56' W

Temperature Range for 99% Confidence Interval

 		OND		NDJ		DJF		JFM		FMA		MAM		AMJ		MJJ		JJA		JAS		ASO		SON		OND		
Median		40.7		30.7		26.5		29.9		38.4		48.7		59.0		67.4		71.8		70.4		63.1		53.0		40.9		
99%		47.1/34.3	38.9/22.5	35.3/17.7	37.6/22.2	44.6/32.2	54.9/42.5	63.9/54.1	72.6/62.2	77.5/66.1	75.0/65.8	67.5/58.7	57.6/48.4	47.3/34.5