Green, OH rainwater: 33,040 gallons off a roof
Rainwater from a roof in Green, OH
33,040gallons a year
That is a 1,500 sq ft asphalt roof under Green, OH's normal 41.6 inches of rain, about 795 gallons for every inch that falls.
In Green, OH a single barrel does most of the work. Storms come often enough that a small tank refills before it runs dry, and a bigger one would mostly sit full.
Rainfall: NOAA 1991-2020 climate normals, the Akron Canton Rgnl Ap station (3.3 mi away). Green, OH ranks 106th wettest of the 176 cities covered in Ohio.
Month by month in Green
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.92 | 2,321 | |
| Feb | 2.44 | 1,939 | |
| Mar | 3.23 | 2,567 | |
| Apr | 3.86 | 3,068 | 61 |
| May | 4.13 | 3,283 | 27 |
| Jun | 4.43 | 3,521 | |
| Jul | 4.14 | 3,290 | 26 |
| Aug | 3.61 | 2,869 | 92 |
| Sep | 3.50 | 2,782 | 106 |
| Oct | 3.34 | 2,655 | 126 |
| Nov | 3.08 | 2,448 | |
| Dec | 2.89 | 2,297 |
Jun is the wettest month (4.43 in, 3,521 gal off the roof); Feb the driest (2.44 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Barrel or cistern in Green?
Best fit: one 55-gallon barrel, which delivers about 339 gallons to the garden in a normal year (77.2% of its need).
If you buy one, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Green's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 339 | 31,381 |
| 110 gal | 339 | 31,381 |
| 165 gal | 339 | 31,381 |
| 275 gal | 339 | 31,381 |
| 550 gal | 339 | 31,381 |
| 1,000 gal | 339 | 31,381 |
| 1,500 gal | 339 | 31,381 |
| 2,500 gal | 339 | 31,381 |
| 5,000 gal | 339 | 31,381 |
Simulated storm by storm through a normal year using the station's count of days with 0.1 in or more of rain each month.
Is rainwater collection legal in Ohio?
Legal. Ohio regulates rainwater cisterns used as a drinking-water source as private water systems (OAC chapter 3701-28): local health department permit, continuous disinfection and filtration. No state rule restricting non-potable collection or storage size.
Checked against the current source on 2026-11-06. Source