Heating and Wind Design Conditions for Illinois

City Lat. Long. Elev. Std. Pres. Heating Dry Bulb, °C Extreme Wind Speed, m/s Coldest Month WS / MCDB MCWS / MCWD to DB Annual Extreme Daily
0.4% 1% 99.6% 0.4% Mean DB Std. DB
°N °W Meters kPa 99.6% 99% 1% 2.5% 5% WS MCDB WS MCDB MCWS PWD MCWS PWD Max Min Max Min
Belleville, Scott AFB 38.55 89.85 138 99.68 -16.2 -12.4 9.3 8.0 6.9 10.2 0.0 9.1 -0.8 3.2 360 3.1 190 37.5 -19.5 1.7 4.0
Chicago, Meigs Field 41.78 87.75 190 99.06 -20.0 -16.1 10.4 9.6 8.7 11.4 -8.2 10.1 -1.0 5.4 240 5.6 220 36.0 -23.4 1.8 4.5
Chicago, O’Hare Int’l A 41.98 87.90 205 98.89 -21.2 -18.1 11.7 10.4 9.2 12.0 -4.6 10.4 -4.9 4.6 270 5.4 230 35.4 -24.6 1.6 3.6
Decatur 39.83 88.87 208 98.85 -19.0 -15.9 10.8 9.8 9.1 12.0 -4.2 10.5 -2.8 5.7 310 5.2 210 37.0 -23.2 3.2 4.0
Glenview, NAS 42.08 87.82 199 98.96 -19.7 -15.7 9.7 8.4 7.4 10.1 -8.4 9.0 -4.0 4.7 250 4.3 240 36.4 -23.6 1.7 4.3
Marseilles 41.37 88.68 225 98.65 -20.4 -17.3 11.4 10.0 8.9 12.6 -7.6 11.2 -6.0 5.2 290 4.5 250 35.4 -24.1 2.2 3.3
Moline/Davenport IA 41.45 90.52 181 99.17 -22.4 -19.3 11.6 10.1 9.0 12.7 -8.7 10.8 -8.0 4.2 290 5.2 200 36.2 -25.7 1.5 3.3
Peoria 40.67 89.68 202 98.92 -21.1 -18.1 11.0 9.7 8.7 11.7 -8.7 10.1 -7.2 4.1 290 4.9 180 35.4 -24.6 1.8 3.4
Quincy 39.95 91.20 234 98.55 -19.9 -16.6 10.8 9.6 8.8 12.5 -5.0 10.7 -5.6 5.4 330 5.2 210 36.2 -23.3 2.0 4.5
Rockford 42.20 89.10 226 98.64 -23.1 -20.1 11.4 10.0 9.1 11.4 -7.6 10.0 -6.9 3.9 290 5.6 200 35.1 -26.6 1.7 3.1
Springfield 39.85 89.67 187 99.10 -19.7 -16.6 11.7 10.4 9.4 12.0 -3.8 10.5 -2.8 4.5 270 5.3 230 36.2 -23.9 1.6 3.1
West Chicago 41.92 88.25 231 98.58 -21.6 -18.0 10.3 9.3 8.4 11.1 -10.3 10.1 -6.6 5.1 290 4.8 240 35.6 -25.5 1.8 4.3