Annual Average Relative Humidity by US State

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The average humidity during the year is listed here for each state in the United States. The tables give annual averages for morning and afternoon relative humidity levels.

For each state, the 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.

Since so few weather stations measure humidity, meaningful state-wide averages aren't available. Instead the tables list a place for each state that represents the state's typical humidity levels.

For information on the humidity by month and at more places in a state, click on the state's name.

Average annual relative humidity (%)
State Place Morning Afternoon
Alabama Birmingham 84 52
Alaska Anchorage 77 64
Arizona Tucson 53 25
Arkansas Fort Smith 85 49
California San Diego 76 62
Colorado Grand Junction 60 35
Connecticut Hartford 79 52
Delaware Wilmington 79 54
Florida Tampa 87 57
Georgia Macon 86 50
Hawaii Honolulu 71 56
Idaho Boise 68 41
Illinois Peoria 83 58
Indiana Indianapolis 83 58
Iowa Des Moines 78 56
Kansas Wichita 80 50
Kentucky Louisville 79 55
Louisiana New Orleans 87 61
Maine Portland 82 61
Maryland Baltimore 77 52
Massachusetts Boston 75 59
Michigan Lansing 84 61
Minnesota Minneapolis 78 55
Mississippi Jackson 91 54
Missouri Springfield 82 53
Relative humidity (%) average for the year
State Place Morning Afternoon
Montana Helena 71 45
Nebraska Lincoln 82 53
Nevada Reno 71 32
New Hampshire Concord 84 53
New Jersey Atlantic City 83 59
New Mexico Albuquerque 60 29
New York Syracuse 82 61
North Carolina Greensboro 83 52
North Dakota Bismarck 80 51
Ohio Columbus 80 57
Oklahoma Oklahoma City 79 48
Oregon Portland 85 59
Pennsylvania Harrisburg 77 54
Rhode Island Providence 78 57
South Carolina Columbia 86 49
South Dakota Huron 83 53
Tennessee Nashville 84 53
Texas Dallas 82 49
Utah Salt Lake City 67 43
Vermont Burlington 77 58
Virginia Richmond 84 52
Washington Seattle 83 62
West Virginia Beckley 83 59
Wisconsin Madison 84 58
Wyoming Lander 63 43
References

National Climatic Data Center. Comparative Climatic Data.

World Data Center for Meteorology. Climate of the World.

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