Sebastian, FL rainwater: 45,550 gallons off a roof
Rainwater from a roof in Sebastian, FL
45,550gallons a year
That is a 1,500 sq ft asphalt roof under Sebastian, FL's normal 57.3 inches of rain, about 795 gallons for every inch that falls.
In Sebastian, FL 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 Micco 1.3 Nw station (7.9 mi away). Sebastian, FL ranks 68th wettest of the 173 cities covered in Florida.
Month by month in Sebastian
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.87 | 2,281 | |
| Feb | 2.37 | 1,884 | |
| Mar | 2.98 | 2,369 | |
| Apr | 2.78 | 2,210 | 196 |
| May | 4.15 | 3,298 | 25 |
| Jun | 6.60 | 5,246 | |
| Jul | 8.03 | 6,382 | |
| Aug | 8.06 | 6,406 | |
| Sep | 8.10 | 6,438 | |
| Oct | 5.80 | 4,610 | |
| Nov | 2.96 | 2,353 | |
| Dec | 2.61 | 2,074 |
Sep is the wettest month (8.10 in, 6,438 gal off the roof); Feb the driest (2.37 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 Sebastian
Best fit: one 55-gallon barrel, which delivers about 183 gallons to the garden in a normal year (82.9% 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 Sebastian's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 183 | 44,107 |
| 110 gal | 183 | 44,107 |
| 165 gal | 183 | 44,107 |
| 275 gal | 183 | 44,107 |
| 550 gal | 183 | 44,107 |
| 1,000 gal | 183 | 44,107 |
| 1,500 gal | 183 | 44,107 |
| 2,500 gal | 183 | 44,107 |
| 5,000 gal | 183 | 44,107 |
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 Florida?
Legal. Florida approves onsite non-potable use of rainwater for landscape irrigation, vehicle washing, filling pools and fountains and, in some local jurisdictions, toilet/urinal flushing (Florida Plumbing Code). No state storage cap or registration for non-potable collection.
Checked against the current source on 2026-11-06. Source