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 |