America’s Most Humid Cities
The amount of water vapor in the air — more commonly referred to as humidity — can turn a lovely day stiflingly hot or chillingly wet, depending on the temperature. While humidity is necessary to make rain and helpful at keeping the flu at bay, it isn’t always harmless. Hot, humid air can trigger asthma attacks. It can damage paper, destroy priceless museum pieces and literally rain on your parade. High humidity can also affect allergies to mold, dust mites and pollen.
Humidity varies from place to place. Warm air generally contains more water vapor than cold air, which may be why the air feels moister in Honolulu than in New York. The time of day makes a difference, too. You’ll notice that it’s more humid in the morning in almost every city. This is because of the dew point — the temperature that the air must cool to in order to hit a relative humidity of 100%. Relative humidity is the amount of moisture that’s actually in the air versus how much it’s capable of holding at a given temperature. Since low overnight temperatures are often close to the dew point, relative humidity is usually highest around sunrise.
Using climatic data from the National Oceanic and Atmospheric Administration, GOBankingRates found the average relative humidity for some of the country’s largest cities to determine the most humid major American city.
50. Las Vegas
Morning humidity: 36%
Afternoon humidity: 20%
Average humidity: 28%
Average temperature: 72.2 degrees
49. Phoenix
Morning humidity: 46%
Afternoon humidity: 23%
Average humidity: 34.5%
Average temperature: 76.4 degrees
48. Tucson, Arizona
Morning humidity: 47%
Afternoon humidity: 24%
Average humidity: 35.5%
Average temperature: 71.7 degrees
47. El Paso, Texas
Morning humidity: 50%
Afternoon humidity: 27%
Average humidity: 38.5%
Average temperature: 68.1 degrees
46. Albuquerque, New Mexico
Morning humidity: 53%
Afternoon humidity: 29%
Average humidity: 41%
Average temperature: 59.1 degrees
45. Denver
Morning humidity: 50%
Afternoon humidity: 43%
Average humidity: 46.5%
Average temperature: N/A
44. Colorado Springs, Colorado
Morning humidity: 58%
Afternoon humidity: 40%
Average humidity: 49%
Average temperature: 51.2 degrees
43. Bakersfield, California
Morning humidity: 62%
Afternoon humidity: 37%
Average humidity: 49.5%
Average temperature: N/A
42. Los Angeles
Morning humidity: 58%
Afternoon humidity: 54%
Average humidity: 56%
Average temperature: 65.2 degrees
41. Fresno, California
Morning humidity: 73%
Afternoon humidity: 40%
Average humidity: 56.5%
Average temperature: 66 degrees
40. Sacramento, California
Morning humidity: 78%
Afternoon humidity: 45%
Average humidity: 61.5%
Average temperature: 61.7 degrees
39. New York
Morning humidity: 70%
Afternoon humidity: 54%
Average humidity: 62%
Average temperature: 55.9 degrees
38. Washington
Morning humidity: 74%
Afternoon humidity: 53%
Average humidity: 63.5%
Average temperature: 59.8 degrees
37. Boston
Morning humidity: 72%
Afternoon humidity: 57%
Average humidity: 64.5%
Average temperature: 53 degrees
36. Honolulu
Morning humidity: 74%
Afternoon humidity: 56%
Average humidity: 65%
Average temperature: 79.4 degrees
35. Long Beach, California
Morning humidity: 75%
Afternoon humidity: 55%
Average humidity: 65%
Average temperature: N/A
34. Baltimore
Morning humidity: 77%
Afternoon humidity: 53%
Average humidity: 65%
Average temperature: 56.7 degrees
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33. Philadelphia
Morning humidity: 76%
Afternoon humidity: 54%
Average humidity: 65%
Average temperature: 57.5 degrees
32. Dallas
Morning humidity: 78%
Afternoon humidity: 54%
Average humidity: 66%
Average temperature: 68.3 degrees
31. Charlotte, North Carolina
Morning humidity: 81%
Afternoon humidity: 52%
Average humidity: 66.5%
Average temperature: 62.6 degrees
30. Wichita, Kansas
Morning humidity: 80%
Afternoon humidity: 55%
Average humidity: 67.5%
Average temperature: 58 degrees
29. Oklahoma City
Morning humidity: 80%
Afternoon humidity: 55%
Average humidity: 67.5%
Average temperature: 60.3 degrees
28. Louisville, Kentucky
Morning humidity: 79%
Afternoon humidity: 56%
Average humidity: 67.5%
Average temperature: 59.5 degrees
27. Raleigh, North Carolina
Morning humidity: 83%
Afternoon humidity: 53%
Average humidity: 68%
Average temperature: 61.8 degrees
26. Atlanta
Morning humidity: 81%
Afternoon humidity: 55%
Average humidity: 68%
Average temperature: 64.5 degrees
25. Memphis, Tennessee
Morning humidity: 80%
Afternoon humidity: 56%
Average humidity: 68%
Average temperature: 63.2 degrees
24. Tulsa, Oklahoma
Morning humidity: 81%
Afternoon humidity: 56%
Average humidity: 68.5%
Average temperature: 61.2 degrees
23. San Diego
Morning humidity: 74%
Afternoon humidity: 63%
Average humidity: 68.5%
Average temperature: 66 degrees
22. Minneapolis
Morning humidity: 79%
Afternoon humidity: 59%
Average humidity: 69%
Average temperature: 46.5 degrees
21. Columbus, Ohio
Morning humidity: 80%
Afternoon humidity: 58%
Average humidity: 69%
Average temperature: 54.6 degrees
20. Austin, Texas
Morning humidity: 83%
Afternoon humidity: 55%
Average humidity: 69%
Average temperature: 70.4 degrees
19. San Antonio
Morning humidity: 83%
Afternoon humidity: 55%
Average humidity: 69%
Average temperature: 70.2 degrees
18. Cleveland
Morning humidity: 79%
Afternoon humidity: 61%
Average humidity: 70%
Average temperature: 52.6 degrees
17. Omaha, Nebraska
Morning humidity: 81%
Afternoon humidity: 59%
Average humidity: 70%
Average temperature: 51.6 degrees
16. Nashville, Tennessee
Morning humidity: 84%
Afternoon humidity: 56%
Average humidity: 70%
Average temperature: 61.7 degrees
15. Chicago
Morning humidity: 80%
Afternoon humidity: 60%
Average humidity: 70%
Average temperature: 51 degrees
14. Knoxville, Tennessee
Morning humidity: 84%
Afternoon humidity: 57%
Average humidity: 70.5%
Average temperature: 60.3 degrees
13. Portland, Oregon
Morning humidity: 82%
Afternoon humidity: 59%
Average humidity: 70.5%
Average temperature: 56.4 degrees
12. Kansas City, Missouri
Morning humidity: 81%
Afternoon humidity: 60%
Average humidity: 70.5%
Average temperature: 54.7 degrees
11. Milwaukee
Morning humidity: 79%
Afternoon humidity: 63%
Average humidity: 71%
Average temperature: 48.9 degrees
10. Indianapolis
Morning humidity: 82%
Afternoon humidity: 60%
Average humidity: 71%
Average temperature: 54.3 degrees
9. Miami
Morning humidity: 82%
Afternoon humidity: 61%
Average humidity: 71.5%
Average temperature: 78.3 degrees
8. Orlando, Florida
Morning humidity: 88%
Afternoon humidity: 55%
Average humidity: 71.5%
Average temperature: 73.9 degrees
7. Tampa, Florida
Morning humidity: 86%
Afternoon humidity: 58%
Average humidity: 72%
Average temperature: 75.6 degrees
6. Jacksonville, Florida
Morning humidity: 88%
Afternoon humidity: 56%
Average humidity: 72%
Average temperature: 70 degrees
5. Seattle
Morning humidity: 82%
Afternoon humidity: 63%
Average humidity: 72.5%
Average temperature: 54.4 degrees
4. Baton Rouge, Louisiana
Morning humidity: 89%
Afternoon humidity: 59%
Average humidity: 74%
Average temperature: 69.6 degrees
3. Houston
Morning humidity: 89%
Afternoon humidity: 59%
Average humidity: 74%
Average temperature: 71.5 degrees
2. New Orleans
Morning humidity: 87%
Afternoon humidity: 62%
Average humidity: 74.5%
Average temperature: 71.7 degrees
1. San Francisco
Morning humidity: 87%
Afternoon humidity: 69%
Average humidity: 78%
Average temperature: N/A
Tips for Living in America's Most Humid Cities
If you live in a city with high humidity:
Look for and fix any leaks in your pipes that might be creating water damage in or under your home.
Put in ventilation fans, particularly in bathrooms, but generally in any part of the house where humidity is wreaking havoc.
Seal air leaks with caulk, or consider replacing windows that leak. A trick to test for air leaks is holding a lit incense stick on a windy day beside any place where air might leak. This includes windows, doors, electrical boxes, outlets, etc.
Consider buying a government-approved dehumidifier.
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Methodology: GOBankingRates found the average relative humidity for some of America’s largest cities in order to determine the most humid major U.S. city. GOBankingRates first analyzed the National Oceanic and Atmospheric Administration’s Comparative Climatic Data 2018 on average relative humidity for 250 American cities. This NOAA report gave the annual morning and afternoon relative humidity figures for each city, which were then averaged to give each city an annual average overall relative humidity. GOBankingRates then used Zillow’s size listing data in order to determine America’s top 50 cities (not all top 50 cities had NOAA data, but all cities included in the list land in the top 60 largest cities). These 50 major cities were then ranked from the most humid to the least. Supplemental data for each city’s average 2018 temperature was provided in degrees Fahrenheit. All research used to conduct this ranking was compiled on July 18, 2019.
This article originally appeared on GOBankingRates.com: America’s Most Humid Cities