Heating and Wind Design Conditions for Washington

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
Bellingham 48.80 122.53 157 14.612 15 21 23 20 18 28 33 23 34 17 40 9 290 87 11 3.1 7.4
Hanford 46.57 119.60 732 14.311 5 12 25 21 18 24 44 19 44 6 20 8 20 105 2 3.1 9.0
Olympia 46.97 122.90 200 14.589 18 23 21 18 16 21 45 19 45 5 180 8 50 94 10 4.0 8.1
Quillayute 47.95 124.55 203 14.588 23 27 33 27 21 41 45 35 45 7 60 9 240 87 19 8.4 6.4
Seattle, Int’l Airport 47.45 122.30 449 14.458 23 28 22 19 17 24 44 21 44 10 10 10 350 92 19 3.6 6.8
Spokane, Fairchild AFB 47.62 117.65 2461 13.435 1 7 27 23 20 28 39 25 38 7 50 9 240 98 -7 3.2 8.7
Stampede Pass 47.28 121.33 3967 12.708 3 10 21 19 16 27 19 22 25 13 90 7 100 84 2 3.2 7.2
Tacoma, McChord AFB 47.13 122.48 322 14.525 18 24 18 15 13 22 45 18 46 2 180 7 20 94 12 2.7 6.8
Walla Walla 46.10 118.28 1204 14.067 4 12 22 19 17 24 49 22 47 6 180 9 300 105 1 3.2 11.7
Wenatchee 47.40 120.20 1243 14.047 3 9 22 19 17 17 36 12 31 3 100 9 280 101 -2 2.5 7.2
Yakima 46.57 120.53 1066 14.138 4 11 24 20 17 23 47 19 43 7 250 7 90 101 -2 3.2 8.5