Fremont, OH rainwater: 30,362 gallons off a roof
Rainwater from a roof in Fremont, OH
30,362gallons a year
That is a 1,500 sq ft asphalt roof under Fremont, OH's normal 38.2 inches of rain, about 795 gallons for every inch that falls.
In Fremont, 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 Fremont station (1.4 mi away). Fremont, OH ranks 153rd wettest of the 176 cities covered in Ohio.
Month by month in Fremont
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.73 | 2,170 | |
| Feb | 2.42 | 1,923 | |
| Mar | 2.81 | 2,233 | |
| Apr | 3.83 | 3,044 | 65 |
| May | 3.80 | 3,020 | 69 |
| Jun | 4.10 | 3,259 | 31 |
| Jul | 3.63 | 2,885 | 90 |
| Aug | 3.37 | 2,678 | 122 |
| Sep | 3.23 | 2,567 | 140 |
| Oct | 2.91 | 2,313 | 180 |
| Nov | 2.77 | 2,202 | |
| Dec | 2.60 | 2,066 |
Jun is the wettest month (4.10 in, 3,259 gal off the roof); Feb the driest (2.42 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 Fremont
Best fit: one 55-gallon barrel, which delivers about 533 gallons to the garden in a normal year (76.6% 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 Fremont's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 533 | 28,554 |
| 110 gal | 533 | 28,554 |
| 165 gal | 533 | 28,554 |
| 275 gal | 533 | 28,554 |
| 550 gal | 533 | 28,554 |
| 1,000 gal | 533 | 28,554 |
| 1,500 gal | 533 | 28,554 |
| 2,500 gal | 533 | 28,554 |
| 5,000 gal | 533 | 28,554 |
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