Cloudiest Cities in America
The west coast cities of Portland and Seattle top the list of cloudiest large cities in the United States.
Overall, nine major American cities have solid overcast for more than 180 days a year. Besides the Pacific Northwest, cities with frequent cloudy weather are mainly near the Great Lakes.
The major cities included in the weather rankings represent the metropolitan areas in the United States with over one million people in 2010.
|City||Days of Heavy Cloud||% of Days|
|Buffalo, New York||208||57|
|Rochester, New York||200||55|
Most Cloudy Days
Days of partial cloud are more common in Buffalo than in Seattle or Portland. Partial cloud is defined as cloud covering from over one-quarter to as much as three-quarters of the sky.
When days with partial cloud are added to the days of heavy cloud, to include every day that cloud covers more than one-quarter of the sky, then Buffalo's average of 311 days a year edges out Seattle's 308 days. Portland drops down to the country's sixth cloudiest major city.
|City||Cloudy Days a Year||% of Days|
|Buffalo, New York||311||85|
|Rochester, New York||304||83|
Fourteen of America's major cities average over 110 days a year of partially cloudy weather. These are days when cloud covers between one-quarter and three-quarters of the sky.
None of these partially cloudy cities have enough days of heavy overcast, when cloud covers more than three-quarters of the sky, to rank among the cloudiest cities in the United States.
|City||Partially Cloudy Days||% of Days|
|New York, New York||127||35|
|San Antonio, Texas||119||33|
|New Orleans, Louisiana||118||32|
|San Diego, California||117||32|
|Los Angeles, California||116||32|
NOAA National Climatic Data Center. Comparative Climatic Data Publication.