How much rainwater can your roof collect?
Every inch of rain on 1,000 square feet of roof is about 623 gallons. Find your city to see its normal rain month by month, what a typical roof catches, the barrel or cistern size worth buying, and what your state allows you to store.
3,206 US cities, rainfall from the nearest NOAA station.
Same roof, very different year
- Seattle, WA 30,560 gal 3 linked 55-gallon barrels
- Phoenix, AZ 6,732 gal a 1,500-gallon cistern
- Miami, FL 45,447 gal one 55-gallon barrel
- Denver, CO 12,208 gal 2 linked 55-gallon barrels
Seattle's roof catches 4.5 times what Phoenix's does, yet Seattle gets by on 165 gallons of storage while Phoenix needs 1,500 to carry winter rain into summer. Rain total and tank size are different questions.
Browse every city by state
- Alabama66
- Alaska4
- Arizona44
- Arkansas39
- California376
- Colorado53
- Connecticut21
- Delaware6
- District of Columbia1
- Florida173
- Georgia101
- Hawaii1
- Idaho26
- Illinois225
- Indiana88
- Iowa41
- Kansas38
- Kentucky42
- Louisiana35
- Maine11
- Maryland23
- Massachusetts58
- Michigan90
- Minnesota103
- Mississippi41
- Missouri80
- Montana8
- Nebraska16
- Nevada10
- New Hampshire11
- New Jersey116
- New Mexico19
- New York90
- North Carolina91
- North Dakota9
- Ohio176
- Oklahoma45
- Oregon57
- Pennsylvania68
- Rhode Island8
- South Carolina42
- South Dakota14
- Tennessee65
- Texas252
- Utah67
- Vermont4
- Virginia39
- Washington91
- West Virginia13
- Wisconsin98
- Wyoming11