Auburn, GA rainwater: 42,546 gallons off a roof
How much rain a roof in Auburn, GA collects
42,546gallons a year
That is a 1,500 sq ft asphalt roof under Auburn, GA's normal 53.5 inches of rain, about 795 gallons for every inch that falls.
In Auburn, 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 Dacula 2.1 Nnw station (3.6 mi away). Auburn, GA ranks 39th wettest of the 101 cities covered in Georgia.
Month by month in Auburn
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 4.99 | 3,966 | |
| Feb | 4.68 | 3,720 | |
| Mar | 4.92 | 3,910 | |
| Apr | 3.78 | 3,004 | 71 |
| May | 3.78 | 3,004 | 71 |
| Jun | 5.04 | 4,006 | |
| Jul | 4.44 | 3,529 | |
| Aug | 4.82 | 3,831 | |
| Sep | 4.21 | 3,346 | 17 |
| Oct | 3.84 | 3,052 | 64 |
| Nov | 4.09 | 3,251 | |
| Dec | 4.94 | 3,926 |
Jun is the wettest month (5.04 in, 4,006 gal off the roof); Apr the driest (3.78 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 Auburn?
Best fit: one 55-gallon barrel, which delivers about 186 gallons to the garden in a normal year (83.3% 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 Auburn's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 186 | 41,310 |
| 110 gal | 186 | 41,310 |
| 165 gal | 186 | 41,310 |
| 275 gal | 186 | 41,310 |
| 550 gal | 186 | 41,310 |
| 1,000 gal | 186 | 41,310 |
| 1,500 gal | 186 | 41,310 |
| 2,500 gal | 186 | 41,310 |
| 5,000 gal | 186 | 41,310 |
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