Illinois Climate Data

Below is a collection of Illinois Climate Data and outdoor design conditions. We included an Illinois state average of each category at the bottom of the Manual J climate data table. We created this to allow an easy to use free resource for Manual J professionals to use on jobsites, in the field, and while calculating Manual J heat loss and heat gain reports. If you have a custom set of data from Illinois we would consider adding to the Illinois Climate Data table simply email it to plans@manualjs.com

We can also create a Manual J using climate data from the tables below. Email pdf plans, jobsite address, and square footage to plans@manualjs.com and we will get your Illinois Manual J taken care of.

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Illinois Elevation in Feet Latitude North Degrees Heating 99% Outdoor Dry Bulb Cooling Outdoor Air 1% Dry Bulb Cooling Outdoor Air Coincident Wet Bulb Cooling Design Grains 55% Relative Humidity Indoors Cooling Design Grains 45% Relative Humidity Indoors Cooling Design Grains 45% Relative Humidity Indoors Daily Rating Heating Design Days 65 degrees/Colling Design Days 50 degrees Ratio
Aurora Municipal airport 705 42 1 88 74 30 37 44 M 2.22
Belleville, Scott Air Force Base 453 38 10 93 77 44 51 58 M 1.13
Bloomington (Peoria DD) 875 40 –2 90 74 31 38 45 M 1.8
Cahokia, airport 413 39 14 91 76 43 50 56 M 1.06
Carbondale 411 37 7 93 77 44 51 57 M 1.31
Champaign, Urbana 754 40 2 92 74 28 34 41 M 1.77
Chicago, Meigs Field 593 41 3 89 73 26 33 40 M 1.72
Chicago Midway airport 617 42 4 90 73 27 34 41 M 1.77
Chicago Ohare international airport 673 42 2 89 73 29 36 42 M 2.08
Chicago CO 647 41 2 91 74 29 36 43 L 1.72
Danville 696 40 1 90 74 31 38 44 M 1.59
Decatur 699 40 5 91 76 41 47 54 M 1.55
Dixon 785 41 –2 90 74 31 38 45 M 2.56
Elgin 700 42 –2 88 74 34 41 48 M 2.53
Freeport 856 42 –4 89 73 27 34 40 M 2.8
Galesburg 764 41 –2 91 75 36 42 49 M 1.96
Glenview Naval Auxilary Air Station 653 42 2 90 73 26 32 39 M 2
Greenville (Vandalia DD) 541 39 4 92 75 33 40 47 M 1.49
Joliet 581 41 0 90 74 31 37 44 M 2.15
Kankakee 629 41 1 90 74 31 37 44 M 2.03
LaSalle, Peru 654 41 –2 91 75 35 42 49 M 2.1
Lawrenceville-Vincennes international airport 430 39 12 91 76 38 45 52 M 1.16
Macomb (Galesburg DD) 705 40 0 92 76 40 47 54 M 1.96
Marseilles Island 738 41 0 89 74 33 39 46 M 2.04
Matoon Charleston airport 722 39 9 90 76 42 49 55 M 1.38
Moline Quad City international airport 594 41 0 91 75 36 43 50 M 1.83
Mount Vernon Automated Weather Observation System 479 38 11 91 76 42 48 55 M 1.25
Peoria, Greater Peoria airport 663 41 2 90 75 39 45 52 M 1.68
Baldwin Field 768 40 3 90 75 38 45 52 M 1.54
Rantoul, Chanute Air Force Base 737 40 1 91 74 29 36 43 M 1.78
Rockford, Greater Rockford airport 745 42 -2 89 74 32 38 45 M 2.27
Scott Air Force Base, Bellevill 443 39 10 93 77 42 49 55 M 1.11
Southern Illinois airport 420 38 16 91 77 47 53 60 M 1.01
Springfield Capital airport 614 40 5 91 76 40 46 53 M 1.48
Sterling Rockfalls 646 42 0 88 74 32 38 45 M 2.22
University of Illinois 774 40 4 90 75 40 46 53 M 1.63
Waukegan 727 42 –3 89 74 33 39 46 M 2.72
West Chicago, Du Page airport 758 42 1 88 74 33 40 46 M 2.25
Illinois State Average 649 40.4210526316 4.1935483871 90.3157894737 74.7368421053 34.8157894737 41.4210526316 48.2105263158 M 1.8065789474
Summary
Illinois Climate Data
Article Name
Illinois Climate Data
Description
Illinois Climate Data
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