Monroe, GA rainwater: 40,456 gallons off a roof
How much rain a roof in Monroe, GA collects
40,456gallons a year
That is a 1,500 sq ft asphalt roof under Monroe, GA's normal 50.9 inches of rain, about 795 gallons for every inch that falls.
In Monroe, 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 Winder 4s station (9.0 mi away). Monroe, GA ranks 77th wettest of the 101 cities covered in Georgia.
Month by month in Monroe
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 5.04 | 4,006 | |
| Feb | 4.40 | 3,497 | |
| Mar | 5.19 | 4,125 | |
| Apr | 4.27 | 3,394 | 10 |
| May | 4.17 | 3,314 | 22 |
| Jun | 4.60 | 3,656 | |
| Jul | 4.13 | 3,283 | 27 |
| Aug | 4.87 | 3,871 | |
| Sep | 4.27 | 3,394 | 10 |
| Oct | 3.43 | 2,726 | 115 |
| Nov | 4.04 | 3,211 | |
| Dec | 2.49 | 1,979 |
Mar is the wettest month (5.19 in, 4,125 gal off the roof); Dec the driest (2.49 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Which tank size is worth it in Monroe
Best fit: one 55-gallon barrel, which delivers about 160 gallons to the garden in a normal year (86.7% 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 Monroe's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 160 | 39,246 |
| 110 gal | 160 | 39,246 |
| 165 gal | 160 | 39,246 |
| 275 gal | 160 | 39,246 |
| 550 gal | 160 | 39,246 |
| 1,000 gal | 160 | 39,246 |
| 1,500 gal | 160 | 39,246 |
| 2,500 gal | 160 | 39,246 |
| 5,000 gal | 160 | 39,246 |
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