Circleville, OH rainwater: 32,539 gallons off a roof
How much rain a roof in Circleville, OH collects
32,539gallons a year
That is a 1,500 sq ft asphalt roof under Circleville, OH's normal 40.9 inches of rain, about 795 gallons for every inch that falls.
In Circleville, 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 Circleville station (1.4 mi away). Circleville, OH ranks 130th wettest of the 176 cities covered in Ohio.
Month by month in Circleville
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.89 | 2,297 | |
| Feb | 2.51 | 1,995 | |
| Mar | 3.26 | 2,591 | |
| Apr | 3.99 | 3,171 | 45 |
| May | 4.47 | 3,553 | |
| Jun | 4.65 | 3,696 | |
| Jul | 3.86 | 3,068 | 61 |
| Aug | 3.42 | 2,718 | 116 |
| Sep | 2.96 | 2,353 | 173 |
| Oct | 2.99 | 2,376 | 170 |
| Nov | 2.84 | 2,257 | |
| Dec | 3.10 | 2,464 |
Jun is the wettest month (4.65 in, 3,696 gal off the roof); Feb the driest (2.51 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 Circleville?
Best fit: one 55-gallon barrel, which delivers about 449 gallons to the garden in a normal year (79.5% 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 Circleville's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 449 | 30,845 |
| 110 gal | 449 | 30,845 |
| 165 gal | 449 | 30,845 |
| 275 gal | 449 | 30,845 |
| 550 gal | 449 | 30,845 |
| 1,000 gal | 449 | 30,845 |
| 1,500 gal | 449 | 30,845 |
| 2,500 gal | 449 | 30,845 |
| 5,000 gal | 449 | 30,845 |
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