Findlay, OH rainwater: 29,940 gallons off a roof
Findlay, OH: gallons off the roof each year
29,940gallons a year
That is a 1,500 sq ft asphalt roof under Findlay, OH's normal 37.7 inches of rain, about 795 gallons for every inch that falls.
In Findlay, 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 Findlay Wpcc station (1.3 mi away). Findlay, OH ranks 156th wettest of the 176 cities covered in Ohio.
Month by month in Findlay
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.59 | 2,059 | |
| Feb | 2.19 | 1,741 | |
| Mar | 2.55 | 2,027 | |
| Apr | 3.77 | 2,996 | 72 |
| May | 4.07 | 3,235 | 35 |
| Jun | 4.19 | 3,330 | 20 |
| Jul | 3.90 | 3,100 | 56 |
| Aug | 3.70 | 2,941 | 81 |
| Sep | 2.91 | 2,313 | 180 |
| Oct | 2.71 | 2,154 | 204 |
| Nov | 2.61 | 2,074 | |
| Dec | 2.48 | 1,971 |
Jun is the wettest month (4.19 in, 3,330 gal off the roof); Feb the driest (2.19 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
What size rain barrel for Findlay
Best fit: one 55-gallon barrel, which delivers about 516 gallons to the garden in a normal year (79.6% of its need).
Before you buy, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Findlay's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 516 | 28,284 |
| 110 gal | 516 | 28,284 |
| 165 gal | 516 | 28,284 |
| 275 gal | 516 | 28,284 |
| 550 gal | 516 | 28,284 |
| 1,000 gal | 516 | 28,284 |
| 1,500 gal | 516 | 28,284 |
| 2,500 gal | 516 | 28,284 |
| 5,000 gal | 516 | 28,284 |
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