To distinguish these older numbers we mark them below in italics. NOTE: in the tables below, all numbers before 1945 come from locations in downtown Seattle, which tends to be somewhat warmer than the current official location of Sea-Tac airport. Ĭlimate data for Seattle ( Seattle-Tacoma International Airport), 1991–2020 normals Temperatures above 97 ☏ (36 ☌) and below 15 ☏ (−9 ☌) are very rare, with the last occurrences being Jand November 24, 2010, respectively. In an average year, the temperature will usually be between 21 ☏ (−6 ☌) and 94 ☏ (34 ☌) with temperatures greatly exceeding these values being uncommon. Records are taken from the Seattle City area from 1894 to 1944 and at Sea-Tac Airport from 1945. Hot temperature extremes are enhanced by dry, compressed wind from the west slopes of the Cascades, while cold temperatures are generated mainly from the Fraser Valley in British Columbia. Extreme heatwaves are rare, as are cold temperatures. The Pacific ocean, Puget Sound and Lake Washington serve as moderators of the temperature meaning the city is milder than areas inland during the winter and cooler during the summer. The city's regime of temperature features small seasonal swings, due to its proximity to the ocean. Seattle recorded its highest temperature ever on June 28, reaching 108 ☏ (42 ☌). Temperature Weather report from Seattle-Tacoma Airport in June 2021. Similarly, the city typically receives at least light snowfall every year, though heavy snowfall is uncommon. However, thunderstorms are still rare, as the city reports thunder on just seven days per year. The single-day precipitation record set in October 2003 saw higher precipitation by nearly 2 inches (50mm) than any other day on record. In July 2009 Seattle's all-time high temperature was broken by a margin of 4 degrees Fahrenheit (2.2 Celsius), then broken again by a margin of 5 F (2.8 C) in June 2021. However, the 21st century has seen a trend towards more extreme high-temperature and large-precipitation events. Seattle generally does not experience many extremes of weather. The hottest officially recorded temperature was 108 ☏ (42 ☌) on Jthe coldest recorded temperature was 0 ☏ (−18 ☌) on Januthe record cold daily maximum is 16 ☏ (−9 ☌) on January 14, 1950, while, conversely, the record warm daily minimum is 73 ☏ (23 ☌) on June 27, 2021. Prior to 1945 the official temperatures were observed in locations in downtown Seattle, which tends in general to be somewhat warmer and drier than the airport location. Records for the Seattle City area date back to 1894, with records at Seattle-Tacoma International Airport beginning in 1945, a location notably not within Seattle. The city is part of USDA hardiness zone 9a, with surrounding pockets falling under 8b. The climate is sometimes characterized as a "modified Mediterranean" climate because it is cooler and wetter than a "true" Mediterranean climate, but shares the characteristic dry summer and the associated reliance upon cooler-season precipitation (which has a strong influence on the region's vegetation). It has cool, wet winters and mild, relatively dry summers, covering characteristics of both. The climate of Seattle is temperate, classified in the warm-summer (in contrast to hot-summer) subtype of the Mediterranean zone by the most common climate classification ( Köppen: Csb) although some sources put the city in the oceanic zone ( Trewartha: Do). Seattle experiences around 150 days with at least 0.01 inches (0.25 mm) precipitation each year.
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