Port Wentworth, GA rainwater: 38,246 gallons off a roof
Port Wentworth, GA: gallons off the roof each year
38,246gallons a year
That is a 1,500 sq ft asphalt roof under Port Wentworth, GA's normal 48.1 inches of rain, about 795 gallons for every inch that falls.
In Port Wentworth, 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 Savannah Intl Ap station (4.3 mi away). Port Wentworth, GA ranks 95th wettest of the 101 cities covered in Georgia.
Month by month in Port Wentworth
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.28 | 2,607 | |
| Feb | 2.80 | 2,225 | |
| Mar | 3.50 | 2,782 | |
| Apr | 3.39 | 2,694 | 120 |
| May | 3.62 | 2,877 | 91 |
| Jun | 6.65 | 5,285 | |
| Jul | 5.75 | 4,570 | |
| Aug | 5.46 | 4,340 | |
| Sep | 4.35 | 3,457 | |
| Oct | 3.72 | 2,957 | 79 |
| Nov | 2.39 | 1,900 | |
| Dec | 3.21 | 2,551 |
Jun is the wettest month (6.65 in, 5,285 gal off the roof); Nov the driest (2.39 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 Port Wentworth
Best fit: one 55-gallon barrel, which delivers about 248 gallons to the garden in a normal year (85.7% 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 Port Wentworth's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 248 | 36,933 |
| 110 gal | 248 | 36,933 |
| 165 gal | 248 | 36,933 |
| 275 gal | 248 | 36,933 |
| 550 gal | 248 | 36,933 |
| 1,000 gal | 248 | 36,933 |
| 1,500 gal | 248 | 36,933 |
| 2,500 gal | 248 | 36,933 |
| 5,000 gal | 248 | 36,933 |
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