Annual Average Relative Humidity in US Cities

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The average humidity during the year is listed here for the largest cities in the United States. The tables below give annual averages for the day along with morning and afternoon relative humidity levels.

Relative humidity measures the actual amount of moisture in the air as a percentage of the maximum amount of moisture the air can hold.

For each city, the Daily number gives the average of humidity readings taken every three hours throughout the day. Morning values are recorded between 4 and 6 am local standard time, when usually temperatures are coolest and humidity highest. Afternoon humidity percentages are readings taken between 3 and 5 pm local standard time, when normally the day's temperature peaks and relative humidity reaches its lowest point. All the figures are averages for the years 1961 to 1990.

Average Annual Relative Humidity (%)
Daily City Morning Afternoon
68 Atlanta, Georgia 81 52
67 Austin, Texas 84 49
66 Baltimore, Maryland 77 52
70 Birmingham, Alabama 84 52
67 Boston, Massachusetts 75 59
72 Buffalo, New York 81 62
67 Charlotte, North Carolina 81 51
70 Chicago, Illinois 80 57
70 Cincinnati, Ohio 80 56
71 Cleveland, Ohio 80 61
70 Columbus, Ohio 80 57
65 Dallas, Texas 82 49
52 Denver, Colorado 67 40
71 Detroit, Michigan 81 58
66 Hartford, Connecticut 79 52
75 Houston, Texas 90 55
72 Indianapolis, Indiana 83 58
76 Jacksonville, Florida 89 58
68 Kansas City, Missouri 81 55
30 Las Vegas, Nevada 40 20
71 Los Angeles, California 79 64
69 Louisville, Kentucky 79 55
67 Memphis, Tennessee 80 53
73 Miami, Florida 84 62
72 Milwaukee, Wisconsin 80 63
68 Minneapolis, Minnesota 78 55
Relative Humidity (%) Average for the Year
Daily City Morning Afternoon
70 Nashville, Tennessee 84 53
76 New Orleans, Louisiana 88 61
63 New York, New York 71 54
65 Oklahoma City, Oklahoma 79 48
74 Orlando, Florida 89 56
67 Philadelphia, Pennsylvania 78 54
37 Phoenix, Arizona 51 23
68 Pittsburgh, Pennsylvania 78 55
73 Portland, Oregon 85 59
68 Providence, Rhode Island 78 57
70 Raleigh, North Carolina 84 52
70 Richmond, Virginia 84 52
73 Rochester, New York 82 61
67 Sacramento, California 82 46
55 Salt Lake City, Utah 67 43
67 San Antonio, Texas 83 48
69 San Diego, California 76 62
74 San Francisco, California 84 61
73 Seattle, Washington 83 62
70 St. Louis, Missouri 83 55
74 Tampa, Florida 87 57
69 Virginia Beach, Virginia 79 57
64 Washington, DC 75 52
Reference

World Data Center for Meteorology. Climate of the World.

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