Heating and Wind Design Conditions for Washington

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
Bellingham 48.80 122.53 48 100.75 -9.2 -6.0 10.3 9.1 8.2 12.3 0.8 10.1 1.1 7.4 40 4.0 290 30.5 -11.4 1.7 4.1
Hanford 46.57 119.60 223 98.67 -15.1 -11.1 11.2 9.4 8.2 10.8 6.8 8.5 6.7 2.7 20 3.4 20 40.4 -16.9 1.7 5.0
Olympia 46.97 122.90 61 100.59 -7.8 -4.8 9.2 7.9 7.1 9.4 7.0 8.4 7.2 2.1 180 3.8 50 34.6 -12.0 2.2 4.5
Quillayute 47.95 124.55 62 100.58 -5.1 -2.8 14.7 11.9 9.2 18.5 7.1 15.5 7.3 2.9 60 3.8 240 30.8 -7.5 4.7 3.6
Seattle, Int’l Airport 47.45 122.30 137 99.69 -4.8 -2.2 9.8 8.6 7.6 10.6 6.9 9.5 6.7 4.4 10 4.5 350 33.4 -7.4 2.0 3.8
Spokane, Fairchild AFB 47.62 117.65 750 92.63 -17.4 -13.8 11.9 10.3 9.1 12.7 3.9 11.1 3.4 3.1 50 4.0 240 36.5 -21.4 1.8 4.8
Stampede Pass 47.28 121.33 1209 87.62 -16.1 -12.4 9.5 8.3 7.3 12.0 -7.4 10.0 -4.0 5.9 90 3.3 100 29.1 -16.4 1.8 4.0
Tacoma, McChord AFB 47.13 122.48 98 100.15 -7.5 -4.7 8.1 6.9 5.8 9.6 7.1 7.9 7.5 1.0 180 3.1 20 34.5 -10.9 1.5 3.8
Walla Walla 46.10 118.28 367 96.99 -15.6 -11.1 9.9 8.6 7.8 10.9 9.7 9.6 8.6 2.7 180 4.1 300 40.3 -17.4 1.8 6.5
Wenatchee 47.40 120.20 379 96.85 -15.9 -12.6 9.8 8.6 7.7 7.7 2.0 5.5 -0.3 1.4 100 3.9 280 38.1 -18.7 1.4 4.0
Yakima 46.57 120.53 325 97.48 -15.4 -11.8 10.7 9.1 7.6 10.1 8.2 8.3 6.3 2.9 250 3.3 90 38.1 -18.7 1.8 4.7