Perry, GA rainwater: 39,367 gallons off a roof
Rainwater from a roof in Perry, GA
39,367gallons a year
That is a 1,500 sq ft asphalt roof under Perry, GA's normal 49.5 inches of rain, about 795 gallons for every inch that falls.
In Perry, GA 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 Kathleen 2.5 Nw station (6.7 mi away). Perry, GA ranks 89th wettest of the 101 cities covered in Georgia.
Month by month in Perry
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 4.50 | 3,577 | |
| Feb | 4.56 | 3,624 | |
| Mar | 4.61 | 3,664 | |
| Apr | 3.82 | 3,036 | 66 |
| May | 3.02 | 2,400 | 166 |
| Jun | 4.52 | 3,593 | |
| Jul | 4.86 | 3,863 | |
| Aug | 4.60 | 3,656 | |
| Sep | 4.06 | 3,227 | 36 |
| Oct | 2.83 | 2,249 | 190 |
| Nov | 3.47 | 2,758 | |
| Dec | 4.68 | 3,720 |
Jul is the wettest month (4.86 in, 3,863 gal off the roof); Oct the driest (2.83 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 Perry?
Best fit: one 55-gallon barrel, which delivers about 383 gallons to the garden in a normal year (83.7% of its need).
If you buy one, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Perry's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 383 | 37,888 |
| 110 gal | 383 | 37,888 |
| 165 gal | 383 | 37,888 |
| 275 gal | 383 | 37,888 |
| 550 gal | 383 | 37,888 |
| 1,000 gal | 383 | 37,888 |
| 1,500 gal | 383 | 37,888 |
| 2,500 gal | 383 | 37,888 |
| 5,000 gal | 383 | 37,888 |
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 Georgia?
Legal. Outdoor irrigation use is unrestricted; indoor non-potable systems must follow Appendix I 'Rainwater Recycling Systems' of the Georgia amendments to the state plumbing code. No state storage cap; potable use depends on local rules.
Checked against the current source on 2026-11-06. Source