Mansfield, OH rainwater: 33,771 gallons off a roof
Rainwater from a roof in Mansfield, OH
33,771gallons a year
That is a 1,500 sq ft asphalt roof under Mansfield, OH's normal 42.5 inches of rain, about 795 gallons for every inch that falls.
In Mansfield, 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 Mansfield Lahm Muni Ap station (3.8 mi away). Mansfield, OH ranks 67th wettest of the 176 cities covered in Ohio.
Month by month in Mansfield
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.22 | 2,559 | |
| Feb | 2.53 | 2,011 | |
| Mar | 3.34 | 2,655 | |
| Apr | 4.27 | 3,394 | 10 |
| May | 4.19 | 3,330 | 20 |
| Jun | 4.79 | 3,807 | |
| Jul | 3.86 | 3,068 | 61 |
| Aug | 3.60 | 2,861 | 94 |
| Sep | 3.36 | 2,671 | 123 |
| Oct | 3.16 | 2,512 | 148 |
| Nov | 3.15 | 2,504 | |
| Dec | 3.02 | 2,400 |
Jun is the wettest month (4.79 in, 3,807 gal off the roof); Feb the driest (2.53 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 Mansfield?
Best fit: one 55-gallon barrel, which delivers about 357 gallons to the garden in a normal year (78.2% 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 Mansfield's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 357 | 32,064 |
| 110 gal | 357 | 32,064 |
| 165 gal | 357 | 32,064 |
| 275 gal | 357 | 32,064 |
| 550 gal | 357 | 32,064 |
| 1,000 gal | 357 | 32,064 |
| 1,500 gal | 357 | 32,064 |
| 2,500 gal | 357 | 32,064 |
| 5,000 gal | 357 | 32,064 |
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