Miami Gardens, FL rainwater: 54,309 gallons off a roof
How much rain a roof in Miami Gardens, FL collects
54,309gallons a year
That is a 1,500 sq ft asphalt roof under Miami Gardens, FL's normal 68.3 inches of rain, about 795 gallons for every inch that falls.
In Miami Gardens, 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 N Miami Beach #2 station (1.7 mi away). Miami Gardens, FL ranks 10th wettest of the 173 cities covered in Florida.
Month by month in Miami Gardens
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.30 | 1,828 | |
| Feb | 2.72 | 2,162 | |
| Mar | 2.67 | 2,122 | |
| Apr | 3.54 | 2,814 | 101 |
| May | 5.68 | 4,514 | |
| Jun | 9.03 | 7,177 | |
| Jul | 8.30 | 6,597 | |
| Aug | 9.28 | 7,376 | |
| Sep | 10.26 | 8,155 | |
| Oct | 7.34 | 5,834 | |
| Nov | 4.55 | 3,616 | |
| Dec | 2.66 | 2,114 |
Sep is the wettest month (10.26 in, 8,155 gal off the roof); Jan the driest (2.30 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 Miami Gardens
Best fit: one 55-gallon barrel, which delivers about 84 gallons to the garden in a normal year (83.2% 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 Miami Gardens's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 84 | 52,575 |
| 110 gal | 84 | 52,575 |
| 165 gal | 84 | 52,575 |
| 275 gal | 84 | 52,575 |
| 550 gal | 84 | 52,575 |
| 1,000 gal | 84 | 52,575 |
| 1,500 gal | 84 | 52,575 |
| 2,500 gal | 84 | 52,575 |
| 5,000 gal | 84 | 52,575 |
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