Centerville, OH rainwater: 34,177 gallons off a roof
How much rain a roof in Centerville, OH collects
34,177gallons a year
That is a 1,500 sq ft asphalt roof under Centerville, OH's normal 43.0 inches of rain, about 795 gallons for every inch that falls.
In Centerville, 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 Centerville 3.9 S station (3.4 mi away). Centerville, OH ranks 58th wettest of the 176 cities covered in Ohio.
Month by month in Centerville
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.27 | 2,599 | |
| Feb | 2.73 | 2,170 | |
| Mar | 3.68 | 2,925 | |
| Apr | 4.48 | 3,561 | |
| May | 4.51 | 3,585 | |
| Jun | 4.58 | 3,640 | |
| Jul | 3.99 | 3,171 | 45 |
| Aug | 3.17 | 2,520 | 147 |
| Sep | 3.07 | 2,440 | 160 |
| Oct | 3.10 | 2,464 | 156 |
| Nov | 3.08 | 2,448 | |
| Dec | 3.34 | 2,655 |
Jun is the wettest month (4.58 in, 3,640 gal off the roof); Feb the driest (2.73 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Which tank size is worth it in Centerville
Best fit: one 55-gallon barrel, which delivers about 417 gallons to the garden in a normal year (82.2% of its need).
If you set one up, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Centerville's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 417 | 32,545 |
| 110 gal | 417 | 32,545 |
| 165 gal | 417 | 32,545 |
| 275 gal | 417 | 32,545 |
| 550 gal | 417 | 32,545 |
| 1,000 gal | 417 | 32,545 |
| 1,500 gal | 417 | 32,545 |
| 2,500 gal | 417 | 32,545 |
| 5,000 gal | 417 | 32,545 |
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