Venice, FL rainwater: 40,750 gallons off a roof
Rainwater from a roof in Venice, FL
40,750gallons a year
That is a 1,500 sq ft asphalt roof under Venice, FL's normal 51.3 inches of rain, about 795 gallons for every inch that falls.
In Venice, 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 Venice station (1.7 mi away). Venice, FL ranks 152nd wettest of the 173 cities covered in Florida.
Month by month in Venice
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.68 | 2,130 | |
| Feb | 2.00 | 1,590 | |
| Mar | 2.97 | 2,361 | |
| Apr | 2.47 | 1,963 | 234 |
| May | 3.25 | 2,583 | 137 |
| Jun | 7.81 | 6,207 | |
| Jul | 7.39 | 5,874 | |
| Aug | 8.34 | 6,629 | |
| Sep | 7.16 | 5,691 | |
| Oct | 3.35 | 2,663 | 125 |
| Nov | 1.54 | 1,224 | |
| Dec | 2.31 | 1,836 |
Aug is the wettest month (8.34 in, 6,629 gal off the roof); Nov the driest (1.54 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 Venice
Best fit: one 55-gallon barrel, which delivers about 404 gallons to the garden in a normal year (81.4% 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 Venice's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 404 | 39,310 |
| 110 gal | 435 | 39,280 |
| 165 gal | 435 | 39,280 |
| 275 gal | 435 | 39,280 |
| 550 gal | 435 | 39,280 |
| 1,000 gal | 435 | 39,280 |
| 1,500 gal | 435 | 39,280 |
| 2,500 gal | 435 | 39,280 |
| 5,000 gal | 435 | 39,280 |
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