![]() With many more "rain days" than other major American cities, Seattle has a well-earned reputation for frequent rain. The city sees frequent, though light rainfall between October and May, with rainfall becoming lighter and sparser between June and September. Lowest daily temperatures PeriodĬherry Street after heavy snowfall on January 10, 1880 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. Similarly, the city typically receives at least light snowfall every year, though heavy snowfall is uncommon. Thunderstorms are rare, as the city reports thunder on just seven days per year. 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. Records for the Seattle City area date back to 1894, with records at Seattle-Tacoma International Airport beginning in 1945. The city and environs are part of USDA hardiness zone 8b, with isolated coastal pockets falling under 9a. 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 (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 Mediterranean zone by the most common climate classification ( Köppen: Csb) but 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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