Relative Humidity Averages in US Cities

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
61	Fresno, California	73	40
73	Grand Rapids, Michigan	82	62
66	Hartford, Connecticut	79	52
68	Honolulu, Hawaii	74	56
75	Houston, Texas	90	55

Daily	City	Morning	Afternoon
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
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

Daily	City	Morning	Afternoon
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
38	Tucson, Arizona	47	24
66	Tulsa, Oklahoma	81	56
69	Virginia Beach, Virginia	79	57
64	Washington, DC	75	52

Annual Average Relative Humidity in US Cities

Reference

More US City Weather Information