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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.
The 6.1 in (15 cm) of snowfall in Portland, Oregon on February 12 ties the airport monthly record of 6.1 in (15 cm) set Feb 19, 1993. [106] The event proved to be historic for the Portland metropolitan area in the month of February. Some areas in Oregon saw up to 1.5 in (38 mm) of ice accretion. [107]
The map below shows the probability that an area could receive more than 4 inches of snow. Use the slider at the top left to toggle by day. Winter Weather Forecasts