Total Cloudy and Foggy Days at US Cities a Year

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The table below gives averages for how many days a year 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 annual average is based on weather data collected from 1961 to 1990.

Average number of days annually with cloud or fog
City Cloud Fog
Atlanta, Georgia 149 159
Austin, Texas 136 127
Baltimore, Maryland 152 144
Birmingham, Alabama 155 178
Boston, Massachusetts 164 139
Buffalo, New York 208 174
Charlotte, North Carolina 152 168
Chicago, Illinois 176 124
Cincinnati, Ohio 186 166
Cleveland, Ohio 202 157
Columbus, Ohio 190 166
Dallas, Texas 133   91
Denver, Colorado 120   56
Detroit, Michigan 185 156
Hartford, Connecticut 175 162
Houston, Texas 161 194
Indianapolis, Indiana 179 175
Jacksonville, Florida 144 198
Kansas City, Missouri 149 123
Las Vegas, Nevada   73     5
Los Angeles, California 103   92
Louisville, Kentucky 171 142
Memphis, Tennessee 151 115
Miami, Florida 115   43
Milwaukee, Wisconsin 175 142
Minneapolis, Minnesota 169 103

Average number of cloudy and foggy days a year
City Cloud Fog
Nashville, Tennessee 156 164
New Orleans, Louisiana 146 200
New York, New York 132 131
Oklahoma City, Oklahoma 130   96
Orlando, Florida 130 157
Philadelphia, Pennsylvania 160 164
Phoenix, Arizona   70     7
Pittsburgh, Pennsylvania 203 183
Portland, Oregon 222 125
Providence, Rhode Island 164 166
Raleigh, North Carolina 149 198
Richmond, Virginia 160 185
Rochester, New York 200 133
Sacramento, California 100 104
Salt Lake City, Utah 139   46
San Antonio, Texas 141 130
San Diego, California 102   97
San Francisco, California 105 108
Seattle, Washington 226 165
St. Louis, Missouri 164 158
Tampa, Florida 121 133
Virginia Beach, Virginia 153 157
Washington, DC 164 130
References

NOAA National Climatic Data Center. Comparative Climatic Data Publication.

World Data Center for Meteorology. Climate of the World.

 

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