Heating and Wind Design Conditions for Montana
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 | |
Billings | 45.80 | 108.53 | 1088 | 88.92 | -25.1 | -21.8 | 12.3 | 10.7 | 9.7 | 13.3 | -3.9 | 12.0 | -1.2 | 4.2 | 230 | 4.4 | 240 | 37.3 | -28.1 | 1.6 | 3.4 |
Bozeman | 45.78 | 111.15 | 1364 | 85.98 | -29.0 | -24.7 | 9.2 | 8.0 | 6.7 | 8.9 | 2.5 | 7.6 | 1.2 | 1.9 | 140 | 4.0 | 360 | 35.8 | -34.0 | 1.6 | 4.3 |
Butte | 45.95 | 112.50 | 1690 | 82.60 | -30.1 | -25.8 | 10.2 | 9.2 | 8.2 | 9.5 | -1.5 | 8.4 | -1.2 | 1.6 | 150 | 5.6 | 120 | 33.1 | -36.8 | 1.4 | 4.4 |
Cut Bank | 48.60 | 112.37 | 1175 | 87.98 | -29.2 | -26.4 | 15.2 | 13.4 | 12.0 | 18.0 | 2.0 | 15.3 | 2.4 | 3.2 | 320 | 5.8 | 270 | 34.1 | -33.1 | 2.2 | 3.2 |
Glasgow | 48.22 | 106.62 | 700 | 93.19 | -30.2 | -27.1 | 13.1 | 11.5 | 10.2 | 12.5 | -7.8 | 11.0 | -9.3 | 3.6 | 330 | 5.9 | 160 | 37.3 | -33.8 | 1.8 | 3.7 |
Great Falls, Int’l Airport | 47.48 | 111.37 | 1115 | 88.63 | -28.1 | -24.8 | 14.6 | 13.1 | 11.6 | 15.3 | 3.4 | 14.0 | 3.4 | 3.3 | 240 | 5.4 | 230 | 36.8 | -31.8 | 1.8 | 4.1 |
Great Falls, Malmstrom AFB | 47.50 | 111.18 | 1075 | 89.06 | -27.4 | -23.9 | 12.7 | 10.8 | 9.5 | 14.8 | 3.3 | 13.1 | 3.3 | 1.8 | 240 | 3.5 | 260 | 37.0 | -29.8 | 1.8 | 4.4 |
Havre | 48.55 | 109.77 | 792 | 92.17 | -31.6 | -28.4 | 10.8 | 9.4 | 8.4 | 11.5 | 1.7 | 10.2 | 0.4 | 2.5 | 240 | 3.9 | 270 | 38.7 | -36.2 | 2.8 | 4.5 |
Helena | 46.60 | 112.00 | 1188 | 87.84 | -27.5 | -23.5 | 11.1 | 9.8 | 8.7 | 11.2 | 4.3 | 9.6 | 1.7 | 2.0 | 290 | 5.4 | 280 | 35.7 | -30.8 | 1.8 | 4.0 |
Kalispell | 48.30 | 114.27 | 906 | 90.90 | -24.2 | -19.7 | 10.5 | 8.8 | 7.6 | 11.2 | -11.1 | 9.3 | -7.9 | 2.9 | 20 | 4.1 | 170 | 34.7 | -28.4 | 1.6 | 4.8 |
Lewistown | 47.05 | 109.47 | 1270 | 86.97 | -27.9 | -24.2 | 11.4 | 10.1 | 9.1 | 13.0 | 1.4 | 11.3 | 1.4 | 3.3 | 250 | 4.7 | 90 | 34.8 | -31.6 | 1.9 | 4.1 |
Miles City | 46.43 | 105.87 | 801 | 92.07 | -28.2 | -24.7 | 12.0 | 10.1 | 9.0 | 12.3 | -3.8 | 10.3 | -2.8 | 3.7 | 290 | 4.9 | 140 | 39.1 | -31.7 | 1.5 | 3.6 |
Missoula | 46.92 | 114.08 | 972 | 90.18 | -22.8 | -18.3 | 9.9 | 8.6 | 7.5 | 9.9 | -8.1 | 8.5 | -6.3 | 2.9 | 120 | 4.6 | 290 | 36.3 | -26.3 | 1.6 | 4.6 |