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