WSU CAHNRS

Washington State University Extension

Western Washington Tree Fruit & Alternative Fruits

Comparative Heat Units (base 50)

Weather Data for Selected Locations in Western Washington

Source: Washington Climate Series, WSU Cooperative Extension, Pullman

Location Elevation
(ft)
Annual
Precip
Heat Units Temp,
Highest
Temp,
Lowest
Aberdeen 12 84.54 1348 104 6
Anacortes 30 25.70 1683 95 4
Bellingham 112 35.59 1321 94 -4
Buckley 685 49.28 1625 102 -3
Centralia 185 45.53 2005 104 2
Coupeville 50 17.73 1348 98 3
Concrete 270 65.21 2060 102 0
Everett 99 35.24 1574 98 1
Friday Harbor 100 27.40 1354 98 4
Longview 12 45.10 1862 105 1
Monroe 120 46.76 1801 101 -3
Mount Vernon 14 32.01 1521 98 -4
Olympia, Airport 190 52.37 1693 103 -1
Puyallup 50 40.50 1755 101 -3
SeaTac, Airport 386 38.94 1863 99 0
Sedro Woolley 56 46.07 1548 97 -2
Sequim 180 16.81 1288 99 -3
Vancouver 100 39.00 2404 105 -5
Yakima, Airport 1061 7.86 2279 108 -25

Heat units (base 50°) – calculated by the accumulated difference between mean daily temperature and 50° base temperature from March through October. 

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