Galion, OH rainwater: 34,216 gallons off a roof
How much rain a roof in Galion, OH collects
34,216gallons a year
That is a 1,500 sq ft asphalt roof under Galion, OH's normal 43.1 inches of rain, about 795 gallons for every inch that falls.
In Galion, 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 Galion Wtr Wks station (1.4 mi away). Galion, OH ranks 57th wettest of the 176 cities covered in Ohio.
Month by month in Galion
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.16 | 2,512 | |
| Feb | 2.23 | 1,772 | |
| Mar | 2.83 | 2,249 | |
| Apr | 4.18 | 3,322 | 21 |
| May | 4.53 | 3,600 | |
| Jun | 4.83 | 3,839 | |
| Jul | 4.46 | 3,545 | |
| Aug | 3.74 | 2,973 | 76 |
| Sep | 3.49 | 2,774 | 107 |
| Oct | 3.10 | 2,464 | 156 |
| Nov | 3.24 | 2,575 | |
| Dec | 3.26 | 2,591 |
Jun is the wettest month (4.83 in, 3,839 gal off the roof); Feb the driest (2.23 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 Galion?
Best fit: one 55-gallon barrel, which delivers about 283 gallons to the garden in a normal year (78.5% 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 Galion's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 283 | 32,599 |
| 110 gal | 283 | 32,599 |
| 165 gal | 283 | 32,599 |
| 275 gal | 283 | 32,599 |
| 550 gal | 283 | 32,599 |
| 1,000 gal | 283 | 32,599 |
| 1,500 gal | 283 | 32,599 |
| 2,500 gal | 283 | 32,599 |
| 5,000 gal | 283 | 32,599 |
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