Heating and Wind Design Conditions for Montana

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
Billings 45.80 108.53 3570 12.896 -13 -7 28 24 22 30 25 27 30 10 230 10 240 99 -19 2.8 6.2
Bozeman 45.78 111.15 4475 12.469 -20 -12 21 18 15 20 36 17 34 4 140 9 360 96 -29 2.9 7.7
Butte 45.95 112.50 5545 11.980 -22 -14 23 21 18 21 29 19 30 4 150 13 120 92 -34 2.5 7.9
Cut Bank 48.60 112.37 3855 12.760 -21 -16 34 30 27 40 36 34 36 7 320 13 270 93 -28 4.0 5.7
Glasgow 48.22 106.62 2297 13.516 -22 -17 29 26 23 28 18 25 15 8 330 13 160 99 -29 3.2 6.6
Great Falls, Int’l Airport 47.48 111.37 3658 12.854 -19 -13 33 29 26 34 38 31 38 7 240 12 230 98 -25 3.2 7.4
Great Falls, Malmstrom AFB 47.50 111.18 3527 12.917 -17 -11 28 24 21 33 38 29 38 4 240 8 260 99 -22 3.2 7.9
Havre 48.55 109.77 2598 13.367 -25 -19 24 21 19 26 35 23 33 6 240 9 270 102 -33 5.0 8.1
Helena 46.60 112.00 3898 12.740 -18 -10 25 22 19 25 40 22 35 5 290 12 280 96 -24 3.3 7.2
Kalispell 48.30 114.27 2972 13.184 -12 -3 24 20 17 25 12 21 18 7 20 9 170 95 -19 2.9 8.6
Lewistown 47.05 109.47 4167 12.613 -18 -12 26 23 20 29 35 25 35 7 250 11 90 95 -25 3.5 7.3
Miles City 46.43 105.87 2628 13.352 -19 -13 27 23 20 28 25 23 27 8 290 11 140 102 -25 2.7 6.5
Missoula 46.92 114.08 3189 13.079 -9 -1 22 19 17 22 17 19 21 7 120 10 290 97 -15 2.9 8.2