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Glaciers remain year-round on some Cascade peaks higher than 7,000 feet (2,100 m) above sea level. [3] Annual snowfall along the coastal plain averages 1 to 3 inches (2.5 to 7.6 cm) a year, including years with none. Further inland, between the Coast Range and the Cascades, snowfall generally averages from 5 to 10 inches (13 to 25 cm) a year.
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The maps are derived from U.S. climate normals provided by the National Centers for Environment Information (NCEI): The dataset consists of the latest 30-year average of weather data, including ...
The amount of snow received at weather stations varies substantially from year to year. For example, the annual snowfall at Paradise Ranger Station in Mount Rainier National Park has been as little as 266 inches (680 cm) in 2014-2015 and as much as 1,122 inches (2,850 cm) in 1971–1972. [2]
The map is a colorful one, and it shows that the snowiest month of the year can vary quite a bit from region to region, but February stands out as the biggest snow month for major cities in the ...
Snowfall data is much less reliable before the 1970s, but starting the data in the 1970s also meant the analysis included some exceptionally snowy years for that part of the US.
For example, in the Northeast, a typical location will get 16 inches of snow about once every 10 years and 20 inches about once every 25 years, so the thresholds are 4, 10, 20, and 30 inches. For each threshold and each region, a baseline area and population are determined; for a given storm, the area that exceeds a particular threshold will be ...
The snowstorm unloaded 10.8 inches of snow across the city on Wednesday, making Feb. 22 the second-snowiest day in Portland history, only behind the 14.4 inches that fell on Jan. 21, 1943.