Total Cloudy and Foggy Days at US Cities in May





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