Hollywood, FL rainwater: 51,694 gallons off a roof
Rainwater from a roof in Hollywood, FL
51,694gallons a year
That is a 1,500 sq ft asphalt roof under Hollywood, FL's normal 65.0 inches of rain, about 795 gallons for every inch that falls.
In Hollywood, 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 Hollywood station (1.9 mi away). Hollywood, FL ranks 38th wettest of the 173 cities covered in Florida.
Month by month in Hollywood
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.82 | 2,241 | |
| Feb | 2.75 | 2,186 | |
| Mar | 3.41 | 2,710 | |
| Apr | 3.35 | 2,663 | 125 |
| May | 6.60 | 5,246 | |
| Jun | 8.84 | 7,026 | |
| Jul | 6.74 | 5,357 | |
| Aug | 7.46 | 5,929 | |
| Sep | 8.67 | 6,891 | |
| Oct | 8.22 | 6,533 | |
| Nov | 3.72 | 2,957 | |
| Dec | 2.46 | 1,955 |
Jun is the wettest month (8.84 in, 7,026 gal off the roof); Dec the driest (2.46 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Barrel or cistern in Hollywood?
Best fit: one 55-gallon barrel, which delivers about 104 gallons to the garden in a normal year (83.4% of its need).
If you buy one, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Hollywood's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 104 | 50,165 |
| 110 gal | 104 | 50,165 |
| 165 gal | 104 | 50,165 |
| 275 gal | 104 | 50,165 |
| 550 gal | 104 | 50,165 |
| 1,000 gal | 104 | 50,165 |
| 1,500 gal | 104 | 50,165 |
| 2,500 gal | 104 | 50,165 |
| 5,000 gal | 104 | 50,165 |
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