SeaTac Washington Climate Data

Monthly Average Climate Data for SeaTac Washington

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January2.2 °C8.3 °C156.97 mm
February2.2 °C9.7 °C111 mm
March3.5 °C11.8 °C124.46 mm
April5.3 °C14.8 °C93.73 mm
May8.3 °C18.7 °C54.36 mm
June10.7 °C21.1 °C41.91 mm
July12.7 °C24.7 °C19.3 mm
August12.8 °C25 °C22.61 mm
September10.8 °C21.7 °C39.62 mm
October7.3 °C15.7 °C117.35 mm
November4 °C10.7 °C168.15 mm
December2 °C7.8 °C163.58 mm
Annual6.8 °C15.8 °C1113.04 mm

Climate Data for SeaTac Washington

Average First Frost DateNov. 11 - Nov. 20
Average Last Frost DateMar. 21 - Mar. 31
Average Days With Frost20-30 Days
Plant Hardiness Zone - 2023Zone 9a : -6.7°C to -3.9°C
Plant Hardiness Zone - 2012Zone 8b : -9.4°C to -6.7°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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