Celina, OH rainwater: 31,601 gallons off a roof
How much rain a roof in Celina, OH collects
31,601gallons a year
That is a 1,500 sq ft asphalt roof under Celina, OH's normal 39.8 inches of rain, about 795 gallons for every inch that falls.
In Celina, 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 Celina 3 Ne station (1.6 mi away). Celina, OH ranks 145th wettest of the 176 cities covered in Ohio.
Month by month in Celina
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.76 | 2,194 | |
| Feb | 2.32 | 1,844 | |
| Mar | 2.87 | 2,281 | |
| Apr | 3.86 | 3,068 | 61 |
| May | 4.05 | 3,219 | 37 |
| Jun | 4.38 | 3,481 | |
| Jul | 4.58 | 3,640 | |
| Aug | 3.56 | 2,830 | 98 |
| Sep | 2.75 | 2,186 | 199 |
| Oct | 2.86 | 2,273 | 186 |
| Nov | 3.15 | 2,504 | |
| Dec | 2.62 | 2,082 |
Jul is the wettest month (4.58 in, 3,640 gal off the roof); Feb the driest (2.32 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 Celina?
Best fit: one 55-gallon barrel, which delivers about 461 gallons to the garden in a normal year (79.2% 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 Celina's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 461 | 29,940 |
| 110 gal | 461 | 29,940 |
| 165 gal | 461 | 29,940 |
| 275 gal | 461 | 29,940 |
| 550 gal | 461 | 29,940 |
| 1,000 gal | 461 | 29,940 |
| 1,500 gal | 461 | 29,940 |
| 2,500 gal | 461 | 29,940 |
| 5,000 gal | 461 | 29,940 |
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