Port St. Lucie, FL rainwater: 47,736 gallons off a roof
Rainwater from a roof in Port St. Lucie, FL
47,736gallons a year
That is a 1,500 sq ft asphalt roof under Port St. Lucie, FL's normal 60.1 inches of rain, about 795 gallons for every inch that falls.
In Port St. Lucie, 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 Tradition 5.6 W station (3.6 mi away). Port St. Lucie, FL ranks 61st wettest of the 173 cities covered in Florida.
Month by month in Port St. Lucie
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.07 | 2,440 | |
| Feb | 2.43 | 1,931 | |
| Mar | 3.44 | 2,734 | |
| Apr | 3.00 | 2,384 | 168 |
| May | 5.19 | 4,125 | |
| Jun | 8.25 | 6,557 | |
| Jul | 6.47 | 5,142 | |
| Aug | 7.89 | 6,271 | |
| Sep | 7.95 | 6,319 | |
| Oct | 5.69 | 4,522 | |
| Nov | 3.48 | 2,766 | |
| Dec | 3.20 | 2,543 |
Jun is the wettest month (8.25 in, 6,557 gal off the roof); Feb the driest (2.43 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 Port St. Lucie
Best fit: one 55-gallon barrel, which delivers about 135 gallons to the garden in a normal year (80.2% 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 Port St. Lucie's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 135 | 46,221 |
| 110 gal | 135 | 46,221 |
| 165 gal | 135 | 46,221 |
| 275 gal | 135 | 46,221 |
| 550 gal | 135 | 46,221 |
| 1,000 gal | 135 | 46,221 |
| 1,500 gal | 135 | 46,221 |
| 2,500 gal | 135 | 46,221 |
| 5,000 gal | 135 | 46,221 |
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