![]() ![]() See USGS Open-File Report 00-469, USGS Open-File Report 03-463, and USGS Open-File Report 06-1064 for details concerning the identification of the threshold and its performance. 2020 Rainfall - Seattle Weather Blog Home Rain Stats 2020 Rainfall 2020 Rainfall 2020 wrapped up as Seattle’s first wetter-than-normal year since 2017, thanks in large part to a very wet January. Recent analysis has shown that the probability of landslides occurring on a day when the cumulative threshold has been exceeded is roughly 10%. It is interpreted as a lower-bound threshold below which the specified level of landslide activity does not occur or occurs only rarely. Mostly cloudy with a chance of rain showers in the morning, then cloudy with rain. Between 3.5 and 5.2 inches total precipitation during any 18-day period (last 3 days plus the previous 15 days) are required to exceed the cumulative threshold. Including the cities of Seattle, Shoreline, Federal Way, and Kent. ![]() The month with the most rain in Seattle is November, with an average rainfall of 7.5 inches. The threshold was visually identified after plotting antecedent 3-day and prior 15-day cumulative precipitation amounts associated with landslides that were part of events with 3 or more landslides in a 3-day period. Rain falls throughout the year in Seattle. Total Rainfall March 2.1in Daily Average March 0.1in Wettest Day 13 March, 2023 0. Chance of rainfall chart with likely precipitation and statistics in live rain gauge. Seattle monthly rainfall totals for 2022. Seattle-Tacoma International Airport rain forecast information. In a typical year, the total combined rainfall for all of January and. The cumulative precipitation threshold for the occurrence of landslides in the Seattle area is based on an analysis of historical landslide and precipitation data from the period 1933 - 1997. Annual Rainfall In Seattle WaSeattle April Weather, Average Temperature (Washington. As of Tuesday evening, the Seattle area has seen 10.16 total inches of precipitation in the first 33 days of 2021. The Cumulative Precipitation Threshold is (3-day Precipitation)=3.5 - 0.67*(15-day Precipitation). ![]()
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