Heating and Wind Design Conditions for Illinois

City Lat. Long. Elev. Std. Pres. Heating Dry Bulb, °F Extreme Wind Speed, mph Coldest Month WS / MCDB MCWS / MCWD to DB Annual Extreme Daily
0.4% 1% 99.6% 0.4% Mean DB Std. DB
°N °W Feet psia 99.6% 99% 1% 2.5% 5% WS MCDB WS MCDB MCWS PWD MCWS PWD Max Min Max Min
Belleville, Scott AFB 38.55 89.85 453 14.457 3 10 21 18 15 23 32 20 31 7 360 7 190 100 -3 3.1 7.2
Chicago, Meigs Field 41.78 87.75 623 14.367 -4 3 23 22 19 26 17 23 30 12 240 13 220 97 -10 3.2 8.1
Chicago, O’Hare Int’l A 41.98 87.90 673 14.342 -6 -1 26 23 21 27 24 23 23 10 270 12 230 96 -12 2.8 6.5
Decatur 39.83 88.87 682 14.337 -2 3 24 22 20 27 24 24 27 13 310 12 210 99 -10 5.8 7.2
Glenview, NAS 42.08 87.82 653 14.352 -3 4 22 19 17 23 17 20 25 11 250 10 240 98 -10 3.1 7.7
Marseilles 41.37 88.68 738 14.308 -5 1 26 22 20 28 18 25 21 12 290 10 250 96 -11 4.0 5.9
Moline/Davenport IA 41.45 90.52 594 14.383 -8 -3 26 23 20 28 16 24 18 9 290 12 200 97 -14 2.7 6.0
Peoria 40.67 89.68 663 14.347 -6 -1 25 22 20 26 16 23 19 9 290 11 180 96 -12 3.3 6.1
Quincy 39.95 91.20 768 14.292 -4 2 26 23 20 28 23 24 22 12 330 12 210 97 -10 3.6 8.1
Rockford 42.20 89.10 741 14.306 -10 -4 26 23 21 26 18 23 20 9 290 13 200 95 -16 3.1 5.5
Springfield 39.85 89.67 614 14.373 -4 2 25 23 21 27 25 24 27 10 270 12 230 97 -11 2.8 5.5
West Chicago 41.92 88.25 758 14.297 -7 0 23 21 19 25 13 23 20 11 290 11 240 96 -14 3.2 7.7