Lifting of Air As air rises it expands because pressure decreases with altitude. Kinetic energy is converted to potential energy and the parcel temperature decreases, and the relative humidity increases. The two main large scale lifting processes that result in cloud formation are convection and advection of air.

The most common types of precipitation are rain, hail, and snow.

There are many different types of precipitation —rain, snow, hail, and sleet for example—yet they all have a few things in common. They all come from clouds. They are all forms of water that fall from the sky.

When it rains, it will increase the relative humidity because of the evaporation. The air where the rain is falling may not be completely saturated with water vapor. This means that across larger volumes, the average relative humidity reduces through rain.

Given this, the most humid states in the United States are a mix of warm, southern states and cold, northern states….The ten states with the highest relative humidities are:

• Alaska – 77.1%
• Florida – 74.5%
• Louisiana – 74.0%
• Mississippi – 73.6%
• Hawaii – 73.3%
• Iowa – 72.4%
• Michigan – 72.1%
• Indiana – 72.0%

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25 Most Humid Cities in the United States

• Cold Bay, AK — 87% humidity.
• San Francisco, CA — 87% humidity.
• New Orleans, LA — 87% humidity.
• Daytona Beach, FL — 87% humidity.
• Shreveport, LA — 87% humidity.
• Mobile, AL — 87% humidity.
• Montgomery, AL — 87% humidity.
• Asheville, NC — 87% humidity.

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