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 |