Average Number of Hot Days at US Cities in Summer

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The table here lists the usual number of hot days during summer at large cities in the United States. These are days when the temperature climbs to at least 90 or 100 degrees Fahrenheit (32.2 or 37.8 degrees Celsius). The numbers let you compare how often cities across the USA typically get really hot in summer.

The totals are for the months of June, July and August. So the highest number of days possible is 92.

On this list, Phoenix comes closest to the maximum, where 91 days reach temperatures of 90 °F or more during summer. The only major city that normally never gets to 90 degrees this season is San Diego.

The hot summer days averages are based on temperature data collected from 1981 to 2010.

Average number of days in summer when the temperature gets to 90 or 100 °F (32.2 or 37.8 °C)
City 90+ °F 100+ °F
Atlanta, Georgia 32   0
Austin, Texas 78 15
Baltimore, Maryland 21   0
Birmingham, Alabama 46   2
Boston, Massachusetts   9   0
Buffalo, New York   2   0
Charlotte, North Carolina 31   1
Chicago, Illinois 12   0
Cincinnati, Ohio 19   0
Cleveland, Ohio   8   0
Columbus, Ohio 14   0
Dallas, Texas 74 16
Denver, Colorado 28   1
Detroit, Michigan   9   0
Hartford, Connecticut 13   0
Houston, Texas 74   3
Indianapolis, Indiana 13   0
Jacksonville, Florida 57   1
Kansas City, Missouri 36   3
Las Vegas, Nevada 86 60
Los Angeles, California 10   1
Louisville, Kentucky 32   1
Memphis, Tennessee 54   2
Miami, Florida 56   0
Milwaukee, Wisconsin   6   0
Minneapolis, Minnesota 10   0
City 90+ °F 100+ °F
New Orleans, Louisiana 56   0
New York, New York 11   0
Oklahoma City, Oklahoma 58 10
Orlando, Florida 65   0
Philadelphia, Pennsylvania 21   0
Phoenix, Arizona 91 80
Pittsburgh, Pennsylvania   7   0
Portland, Oregon 11   1
Providence, Rhode Island   8   0
Raleigh, North Carolina 40   2
Richmond, Virginia 36   1
Riverside, California 64 17
Rochester, New York   5   0
Sacramento, California 47 10
Salt Lake City, Utah 48   5
San Antonio, Texas 77   8
San Diego, California   0   0
San Francisco, California   1   0
San Jose, California 11   1
Seattle, Washington   2   0
St. Louis, Missouri 34   2
Tampa, Florida 50   0
Virginia Beach, Virginia 24   0
Washington, DC 27   1
References

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

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