Palm Bay, FL rainwater: 47,649 gallons off a roof
Palm Bay, FL: gallons off the roof each year
47,649gallons a year
That is a 1,500 sq ft asphalt roof under Palm Bay, FL's normal 60.0 inches of rain, about 795 gallons for every inch that falls.
In Palm Bay, 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 Palm Bay 2.6 Sse station (1.4 mi away). Palm Bay, FL ranks 62nd wettest of the 173 cities covered in Florida.
Month by month in Palm Bay
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.64 | 2,098 | |
| Feb | 2.60 | 2,066 | |
| Mar | 2.97 | 2,361 | |
| Apr | 3.05 | 2,424 | 162 |
| May | 4.21 | 3,346 | 17 |
| Jun | 9.72 | 7,726 | |
| Jul | 7.40 | 5,882 | |
| Aug | 7.35 | 5,842 | |
| Sep | 8.28 | 6,581 | |
| Oct | 6.03 | 4,793 | |
| Nov | 3.17 | 2,520 | |
| Dec | 2.53 | 2,011 |
Jun is the wettest month (9.72 in, 7,726 gal off the roof); Dec the driest (2.53 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 Palm Bay
Best fit: one 55-gallon barrel, which delivers about 149 gallons to the garden in a normal year (83.0% 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 Palm Bay's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 149 | 46,180 |
| 110 gal | 149 | 46,180 |
| 165 gal | 149 | 46,180 |
| 275 gal | 149 | 46,180 |
| 550 gal | 149 | 46,180 |
| 1,000 gal | 149 | 46,180 |
| 1,500 gal | 149 | 46,180 |
| 2,500 gal | 149 | 46,180 |
| 5,000 gal | 149 | 46,180 |
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