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Alaska
77.1%
Florida
74.5%
Louisiana
74%
Mississippi
73.6%
Hawaii
73.3%
Iowa
72.4%
Michigan
72.1%
Indiana
72%
Maine
71.7%
Vermont
71.7%
Alabama
71.6%
Wisconsin
71.6%
Ohio
71.5%
Rhode Island
71.4%
Washington
71.4%
Georgia
71.1%
Massachusetts
71.1%
Arkansas
70.9%
Delaware
70.9%
Illinois
70.9%
North Dakota
70.9%
New York
70.7%
North Carolina
70.6%
Minnesota
70.4%
New Hampshire
70.4%
Kentucky
70.3%
West Virginia
69.7%
Pennsylvania
69.6%
Tennessee
69.4%
Connecticut
69.2%
Missouri
69.2%
South Carolina
69.1%
Maryland
68.8%
Virginia
68.7%
Oregon
68.6%
New Jersey
68.5%
South Dakota
66.4%
Nebraska
65.8%
Kansas
65.7%
Texas
64.9%
Oklahoma
64%
Idaho
62.4%
California
61%
Montana
60.4%
Wyoming
57.1%
Colorado
54.1%
Utah
51.7%
New Mexico
45.9%
Arizona
38.5%
Nevada
38.3%

Most Humid States 2024

Most Humid States 2024

Humidity is the concentration of water vapor present in the air. Humidity is a byproduct of the water cycle; as water turns into its gaseous state, water vapor, it begins to fill the air. Atmospheric water vapor also plays an important role in the weather and climate, regulating air temperate by absorbing thermal radiation from the Sun and helping generate precipitation.

Local weathermen typically report relative humidity, a percentage representing the amount of water vapor in the air relative to the maximum amount the air can hold. Temperature determines the humidity capacity of air. As temperatures decrease, air molecules compress and can hold less water vapor. At higher temperatures, the air is capable of holding more water vapor.

Humidity levels affect how temperatures are perceived. Higher levels slow the evaporation of sweat and make it more difficult for bodies to regulate their temperatures, resulting in excessive sweating and increased heart rate and respiration. On the other hand, low humidity can dry skin and allow airborne illnesses to spread more quickly. Most people are the most comfortable at around 30-60% humidity.

Most Humid States in the U.S.

Since humidity levels result from evaporation, they tend to be highest in regions near large bodies of water. Landlocked states with very few large bodies of water tend to be the least humid. States like Nevada, Arizona, Colorado, and New Mexico have relatively low humidity and arid climates. On the other hand, Florida and Louisiana have hot, humid climates due to their warm weather and proximity to the Atlantic.

However, because relative humidity has to do with how much water the air can hold at a specific temperature, rather than the amount of water actually in the air, relative humidity can be much higher in cold areas even though there is less overall moisture in the air. For this reason, Alaska tops the nation for relative humidity levels, despite having much lower absolute humidity than most states in the South.

The ten states with the highest levels of relative humidity:

State
Average Relative Humidity
Alaska77.1%
Florida74.5%
Louisiana74%
Mississippi73.6%
Hawaii73.3%
Iowa72.4%
Michigan72.1%
Indiana72%
Maine71.7%
Vermont71.7%

The ten major cities with the highest levels of relative humidity are:

  • New Orleans, Louisiana (75.9%)
  • Jacksonville, Florida (75.8%)
  • Houston, Texas (74.7%)
  • Orlando, Florida (74.1%)
  • Tampa, Florida (74.1%)
  • San Francisco, California (73.7%)
  • Seattle, Washington (73.3%)
  • Miami, Florida (73.2%)
  • Portland, Oregon (73.2%)
  • Rochester, New York (72.6%)

Most Humid States 2024

Notes:
- While humidity is the better-known term, the related indicator "dew point" actually has a stronger impact on whether a person senses the humidity and the air feels "sticky".
- For example, Alaska has the highest relative humidity in the US, but the lowest dew point.
- Both relative humidity and dew point are displayed in the table below.

Download Table Data

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State
Average Relative Humidity
Average Dew Point F
Alaska77.1%26.50
Florida74.5%62.70
Louisiana74%58.30
Mississippi73.6%55.60
Hawaii73.3%65.20
Iowa72.4%39.80
Michigan72.1%38.00
Indiana72%43.00
Maine71.7%34.40
Vermont71.7%35.90
Alabama71.6%54.00
Wisconsin71.6%37.10
Ohio71.5%42.00
Rhode Island71.4%41.60
Washington71.4%39.70
Georgia71.1%53.40
Massachusetts71.1%39.90
Arkansas70.9%50.70
Delaware70.9%45.80
Illinois70.9%42.70
North Dakota70.9%32.60
New York70.7%39.40
North Carolina70.6%50.40
Minnesota70.4%33.90
New Hampshire70.4%36.20
Kentucky70.3%46.60
West Virginia69.7%42.80
Pennsylvania69.6%40.90
Tennessee69.4%48.40
Connecticut69.2%40.70
Missouri69.2%45.40
South Carolina69.1%51.60
Maryland68.8%45.20
Virginia68.7%47.30
Oregon68.6%39.00
New Jersey68.5%42.40
South Dakota66.4%34.60
Nebraska65.8%37.90
Kansas65.7%43.60
Texas64.9%53.60
Oklahoma64%46.80
Idaho62.4%30.90
California61%44.20
Montana60.4%29.70
Wyoming57.1%26.90
Colorado54.1%28.80
Utah51.7%28.60
New Mexico45.9%30.80
Arizona38.5%32.50
Nevada38.3%27.50
showing: 50 rows

Most Humid States 2024

Sources