Gulfport, FL rainwater: 44,541 gallons off a roof
Gulfport, FL: gallons off the roof each year
44,541gallons a year
That is a 1,500 sq ft asphalt roof under Gulfport, FL's normal 56.0 inches of rain, about 795 gallons for every inch that falls.
In Gulfport, 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 South Pasadena 0.6 E station (1.4 mi away). Gulfport, FL ranks 88th wettest of the 173 cities covered in Florida.
Month by month in Gulfport
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.89 | 2,297 | |
| Feb | 2.34 | 1,860 | |
| Mar | 3.04 | 2,416 | |
| Apr | 2.67 | 2,122 | 209 |
| May | 2.95 | 2,345 | 175 |
| Jun | 8.03 | 6,382 | |
| Jul | 8.62 | 6,851 | |
| Aug | 9.62 | 7,646 | |
| Sep | 8.38 | 6,660 | |
| Oct | 3.14 | 2,496 | 151 |
| Nov | 1.72 | 1,367 | |
| Dec | 2.64 | 2,098 |
Aug is the wettest month (9.62 in, 7,646 gal off the roof); Nov the driest (1.72 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 Gulfport
Best fit: one 55-gallon barrel, which delivers about 451 gallons to the garden in a normal year (84.3% of its need).
If you set one up, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Gulfport's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 451 | 43,025 |
| 110 gal | 466 | 43,010 |
| 165 gal | 466 | 43,010 |
| 275 gal | 466 | 43,010 |
| 550 gal | 466 | 43,010 |
| 1,000 gal | 466 | 43,010 |
| 1,500 gal | 466 | 43,010 |
| 2,500 gal | 466 | 43,010 |
| 5,000 gal | 466 | 43,010 |
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