This statistic shows cities in the United States with the highest number of heavy cloud cover days per year. In Seattle, Washington in 2011 there were 226 days with heavy cloud. In Portland, Oregon 222 of heavy cloud were recorded in 2011.
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National Oceanic and Atmospheric Administration. (December 31, 2011). Major U.S. cities with the most heavy cloud cover days per year, data through 2011 [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 26, 2026, from /statistics/226795/us-cities-with-the-most-heavy-cloud-cover-days/
National Oceanic and Atmospheric Administration. "Major U.S. cities with the most heavy cloud cover days per year, data through 2011." Chart. December 31, 2011. ÌÇÐÄÆƽâ°æ. Accessed July 26, 2026. /statistics/226795/us-cities-with-the-most-heavy-cloud-cover-days/
National Oceanic and Atmospheric Administration. (2011). Major U.S. cities with the most heavy cloud cover days per year, data through 2011. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 26, 2026. /statistics/226795/us-cities-with-the-most-heavy-cloud-cover-days/
National Oceanic and Atmospheric Administration. "Major U.S. Cities with The Most Heavy Cloud Cover Days per Year, Data through 2011." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 31 Dec 2011, /statistics/226795/us-cities-with-the-most-heavy-cloud-cover-days/
National Oceanic and Atmospheric Administration, Major U.S. cities with the most heavy cloud cover days per year, data through 2011 ÌÇÐÄÆƽâ°æ, /statistics/226795/us-cities-with-the-most-heavy-cloud-cover-days/ (last visited July 26, 2026)
Major U.S. cities with the most heavy cloud cover days per year, data through 2011 [Graph], National Oceanic and Atmospheric Administration, December 31, 2011. [Online]. Available: /statistics/226795/us-cities-with-the-most-heavy-cloud-cover-days/
