Coral Gables, FL rainwater: 40,495 gallons off a roof
How much rain a roof in Coral Gables, FL collects
40,495gallons a year
That is a 1,500 sq ft asphalt roof under Coral Gables, FL's normal 51.0 inches of rain, about 795 gallons for every inch that falls.
In Coral Gables, 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 Miami Wso City station (2.7 mi away). Coral Gables, FL ranks 154th wettest of the 173 cities covered in Florida.
Month by month in Coral Gables
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.33 | 1,852 | |
| Feb | 2.27 | 1,804 | |
| Mar | 2.03 | 1,613 | |
| Apr | 2.56 | 2,035 | 223 |
| May | 4.62 | 3,672 | |
| Jun | 8.72 | 6,931 | |
| Jul | 4.20 | 3,338 | 19 |
| Aug | 5.85 | 4,650 | |
| Sep | 7.35 | 5,842 | |
| Oct | 5.96 | 4,737 | |
| Nov | 2.61 | 2,074 | |
| Dec | 2.45 | 1,947 |
Jun is the wettest month (8.72 in, 6,931 gal off the roof); Mar the driest (2.03 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 Coral Gables
Best fit: one 55-gallon barrel, which delivers about 200 gallons to the garden in a normal year (82.7% 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 Coral Gables's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 200 | 39,155 |
| 110 gal | 200 | 39,155 |
| 165 gal | 200 | 39,155 |
| 275 gal | 200 | 39,155 |
| 550 gal | 200 | 39,155 |
| 1,000 gal | 200 | 39,155 |
| 1,500 gal | 200 | 39,155 |
| 2,500 gal | 200 | 39,155 |
| 5,000 gal | 200 | 39,155 |
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