Total Cloudy and Foggy Days at US Cities in September





The table below gives averages for how many days in September that major cities in the United States have cloud and fog.

The figure for cloud counts the days when cloud covers at least 80 percent of the sky during daylight hours. The number averages measurements for most of the years that each city's main weather station has collected data.

The totals listed for foggy days includes days with mist. This monthly average is based on weather data collected from 1961 to 1990.

Average number of days in September with cloud or fog
City Cloud Fog
Atlanta, Georgia 10 16
Austin, Texas 9 10
Baltimore, Maryland 11 14
Birmingham, Alabama 11 15
Boston, Massachusetts 12 12
Buffalo, New York 14 15
Charlotte, North Carolina 11 17
Chicago, Illinois 11 12
Cincinnati, Ohio 11 17
Cleveland, Ohio 12 14
Columbus, Ohio 12 16
Dallas, Texas 9 6
Denver, Colorado 8 4
Detroit, Michigan 12 16
Hartford, Connecticut 13 16
Houston, Texas 10 17
Indianapolis, Indiana 11 17
Average number of cloudy and foggy days in September
City Cloud Fog
Jacksonville, Florida 13 18
Kansas City, Missouri 10 11
Las Vegas, Nevada 2 0
Los Angeles, California 6 7
Louisville, Kentucky 11 15
Memphis, Tennessee 10 11
Miami, Florida 12 1
Milwaukee, Wisconsin 12 13
Minneapolis, Minnesota 12 10
Nashville, Tennessee 10 17
New Orleans, Louisiana 10 15
New York, New York 9 11
Oklahoma City, Oklahoma 9 9
Orlando, Florida 12 11
Philadelphia, Pennsylvania 11 15
Phoenix, Arizona 3 0
Pittsburgh, Pennsylvania 13 20
City Cloud Fog
Portland, Oregon 12 11
Providence, Rhode Island 12 15
Raleigh, North Carolina 11 21
Richmond, Virginia 12 19
Rochester, New York 13 14
Sacramento, California 2 2
Salt Lake City, Utah 5 0
San Antonio, Texas 9 9
San Diego, California 6 8
San Francisco, California 4 7
Seattle, Washington 13 16
St. Louis, Missouri 10 15
Tampa, Florida 11 10
Virginia Beach, Virginia 11 15
Washington, DC 12 12
References

NOAA National Climatic Data Center. Comparative Climatic Data Publication.

World Data Center for Meteorology. Climate of the World.

US City Cloud
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