Average Summer Humidity by USA State

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

The Morning humidity values for a state 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.

All of the numbers are averages of several decades of weather measurements. The summer averages are based on data for the months of June, July and August.

Average relative humidity (%) in summer
State Place Morning Afternoon
Alabama Birmingham 88 56
Alaska Anchorage 81 61
Arizona Tucson 52 24
Arkansas Fort Smith 89 49
California San Diego 81 66
Colorado Grand Junction 47 21
Connecticut Hartford 86 52
Delaware Wilmington 85 55
Florida Tampa 89 63
Georgia Macon 91 54
Hawaii Honolulu 66 51
Idaho Boise 57 24
Illinois Peoria 85 54
Indiana Indianapolis 87 55
Iowa Des Moines 80 52
Kansas Wichita 80 44
Kentucky Louisville 85 54
Louisiana New Orleans 90 64
Maine Portland 90 63
Maryland Baltimore 84 53
Massachusetts Boston 81 59
Michigan Lansing 88 54
Minnesota Minneapolis 81 51
Mississippi Jackson 93 55
Missouri Springfield 86 52
State Place Morning Afternoon
Montana Helena 68 32
Nebraska Lincoln 84 49
Nevada Reno 65 20
New Hampshire Concord 92 52
New Jersey Atlantic City 89 59
New Mexico Albuquerque 57 25
New York Syracuse 87 56
North Carolina Greensboro 90 57
North Dakota Bismarck 84 42
Ohio Columbus 86 54
Oklahoma Oklahoma City 81 46
Oregon Portland 82 46
Pennsylvania Harrisburg 84 54
Rhode Island Providence 85 58
South Carolina Columbia 91 54
South Dakota Huron 87 47
Tennessee Nashville 89 54
Texas Dallas 82 44
Utah Salt Lake City 55 24
Vermont Burlington 79 54
Virginia Richmond 91 56
Washington Seattle 82 51
West Virginia Beckley 91 61
Wisconsin Madison 86 53
Wyoming Lander 56 28
References

National Climatic Data Center. Comparative Climatic Data.

World Data Center for Meteorology. Climate of the World.

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