Rooftop Rainwater Harvest Calculator

Rooftop Rainwater Harvest Calculator

Select your state:
Other Alabama Alaska Arizona Arkansas California Colorado Connecticut Delaware Florida Georgia Hawaii Idaho Illinois Indiana Iowa Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Ohio Oklahoma Oregon Pennsylvania Rhode Island South Carolina South Dakota Tennessee Texas Utah Vermont Virginia Washington West Virginia Wisconsin Wyoming
Enter your rooftop area in square feet:

Rainwater harvesting system efficiency (max 100%) or leave empty:

The table shows the average amount of rainfall that each of the 50 states in the USA receives in a year, measured in inches. This information can be helpful for people who are interested in collecting rainwater from their rooftops to use for things like watering plants or even for drinking, as it gives an idea of how much rainfall to expect in a particular area.

For example, if someone lives in Alabama, they can expect an average of 58.3 inches of rain per year. However, if they live in Nevada, they can only expect an average of 9.5 inches of rain per year.

When it comes to rooftop rainwater harvesting, the amount of rainfall is important to consider because it determines how much water can be collected from a rooftop. A larger rooftop will collect more water, but the amount of rainfall in the area will also play a big role.

Overall, the table can be a helpful starting point for someone who is interested in rooftop rainwater harvesting, but it's important to also consider other factors like the size of the rooftop, the type of collection system used, and local regulations and guidelines for rainwater harvesting.

Note: The data used to create this table was obtained from the National Oceanic and Atmospheric Administration (NOAA) and is based on the period from 1981 to 2010.

State	Average Annual Precipitation (inches)
Alabama	58.3
Alaska	22.5
Arizona	13.6
Arkansas	50.6
California	22.2
Colorado	15.9
Connecticut	50.3
Delaware	45.7
Florida	54.5
Georgia	50.7
Hawaii	63.7
Idaho	18.0
Illinois	39.2
Indiana	41.7
Iowa	34.8
Kansas	28.9
Kentucky	50.8
Louisiana	60.1
Maine	42.2
Maryland	44.5
Massachusetts	47.7
Michigan	32.4
Minnesota	27.0
Mississippi	59.0
Missouri	42.2
Montana	15.3
Nebraska	23.1
Nevada	9.5
New Hampshire	42.8
New Jersey	47.1
New Mexico	14.6
New York	41.8
North Carolina	50.3
North Dakota	17.9
Ohio	39.1
Oklahoma	36.5
Oregon	26.6
Pennsylvania	42.9
Rhode Island	47.8
South Carolina	49.9
South Dakota	20.3
Tennessee	54.2
Texas	28.9
Utah	12.2
Vermont	39.4
Virginia	44.3
Washington	38.0
West Virginia	45.3
Wisconsin	30.2
Wyoming	13.6