![]() ![]() This report illustrates the typical weather in Seattle, based on a statistical analysis of historical hourly weather reports and model reconstructions from Januto December 31, 2016. Our beach/pool temperature score is 0 for perceived temperatures below 65☏, rising linearly to 9 for 75☏, to 10 for 82☏, falling linearly to 9 for 90☏, and to 1 for 100☏ or hotter. Our tourism temperature score is 0 for perceived temperatures below 50☏, rising linearly to 9 for 65☏, to 10 for 75☏, falling linearly to 9 for 80☏, and to 1 for 90☏ or hotter. Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more. Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed. The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).įor each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. The coldest month of the year in Seattle is December, with an average low of 38☏ and high of 47☏.Īverage High and Low Temperature in Seattle The cool season lasts for 3.6 months, from November 11 to February 29, with an average daily high temperature below 53☏. The hottest month of the year in Seattle is August, with an average high of 77☏ and low of 58☏. The warm season lasts for 2.8 months, from June 20 to September 12, with an average daily high temperature above 72☏. ![]() Click on each chart for more information. Pass travelers will deal with occasionally slippery roads, but the winter parks will benefit from a fresh coating of winter white on the runs for holiday skiers and boarders.ColdcoolcomfortablewarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow75%75%28%28%clearovercastprecipitation: 7.7 inprecipitation: 7.7 in0.6 in0.6 inmuggy: 0%muggy: 0%0%0%drydrytourism score: 7.3tourism score: 7.30.10.1 This will bring on a few inches of snow in the mountains, too. We'll have a better chance for rain at times on Sunday and again on Presidents Day on Monday as lobes of precipitation rotate around the Pacific Northwest. At the ocean beaches, this storm will churn up higher and unpredictable winter "sneaker waves," so be sure not to turn your back on the Pacific if you're beachcombing in Ocean Shores or Seabrook. Highs will hover again on either side of 50 degrees from Gig Harbor to Carnation. ![]() We'll see increasing clouds overnight, and lows will drop into the 30s.īy sunrise, winds will slowly ease in the foothill communities, and the increasing clouds will throw scattered showers our way. Meanwhile, clouds will continue to increase from the west as this system moves into Oregon. As such, the National Weather Service has upped the Wind Advisory there to a more serious HIGH WIND WARNING, as gusts in places like Covington, North Bend and Index could result in downed trees and power outages. As that rushing air exits the passes or gaps and shoots out into the valleys below, it picks up speed, and the forecasting models are suggesting these winds will gust between 40 and 60/65 mph late Friday night and into Saturday morning. The pressure difference (known as a "gradient") is forcing the air to blow from east to west, and as the air gushes over the Cascades, it bends and twists through the narrow gaps in the terrain. However, the touch of spring came with a price: howling Cascadia Winds are starting to blow, and they'll become our big weather issue after dark.Īn approaching area of low pressure over the ocean is coaxing these winds to get going. What a fantastic Friday! Blue skies and sunshine continued the thawing process, as highs on either side of 50 degrees encouraged the remaining February lowland snow to melt off.
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