Lebanon, OH rainwater: 35,615 gallons off a roof
How much rain a roof in Lebanon, OH collects
35,615gallons a year
That is a 1,500 sq ft asphalt roof under Lebanon, OH's normal 44.8 inches of rain, about 795 gallons for every inch that falls.
In Lebanon, 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 Lebanon 3.4 E station (3.4 mi away). Lebanon, OH ranks 14th wettest of the 176 cities covered in Ohio.
Month by month in Lebanon
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.24 | 2,575 | |
| Feb | 2.81 | 2,233 | |
| Mar | 3.91 | 3,108 | |
| Apr | 4.56 | 3,624 | |
| May | 4.56 | 3,624 | |
| Jun | 4.79 | 3,807 | |
| Jul | 4.50 | 3,577 | |
| Aug | 3.59 | 2,853 | 95 |
| Sep | 3.31 | 2,631 | 130 |
| Oct | 3.10 | 2,464 | 156 |
| Nov | 3.13 | 2,488 | |
| Dec | 3.31 | 2,631 |
Jun is the wettest month (4.79 in, 3,807 gal off the roof); Feb the driest (2.81 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 Lebanon?
Best fit: one 55-gallon barrel, which delivers about 315 gallons to the garden in a normal year (82.8% 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 Lebanon's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 315 | 34,055 |
| 110 gal | 315 | 34,055 |
| 165 gal | 315 | 34,055 |
| 275 gal | 315 | 34,055 |
| 550 gal | 315 | 34,055 |
| 1,000 gal | 315 | 34,055 |
| 1,500 gal | 315 | 34,055 |
| 2,500 gal | 315 | 34,055 |
| 5,000 gal | 315 | 34,055 |
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