Naples, FL rainwater: 39,383 gallons off a roof
Naples, FL: gallons off the roof each year
39,383gallons a year
That is a 1,500 sq ft asphalt roof under Naples, FL's normal 49.6 inches of rain, about 795 gallons for every inch that falls.
In Naples, 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 Naples Muni Ap station (1.2 mi away). Naples, FL ranks 167th wettest of the 173 cities covered in Florida.
Month by month in Naples
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 1.68 | 1,335 | |
| Feb | 1.40 | 1,113 | |
| Mar | 1.88 | 1,494 | |
| Apr | 2.52 | 2,003 | 228 |
| May | 2.76 | 2,194 | 198 |
| Jun | 7.41 | 5,890 | |
| Jul | 7.77 | 6,176 | |
| Aug | 8.89 | 7,066 | |
| Sep | 8.60 | 6,835 | |
| Oct | 3.93 | 3,124 | 52 |
| Nov | 1.39 | 1,105 | |
| Dec | 1.32 | 1,049 |
Aug is the wettest month (8.89 in, 7,066 gal off the roof); Dec the driest (1.32 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 Naples
Best fit: one 55-gallon barrel, which delivers about 390 gallons to the garden in a normal year (81.5% 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 Naples's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 390 | 37,927 |
| 110 gal | 417 | 37,900 |
| 165 gal | 417 | 37,900 |
| 275 gal | 417 | 37,900 |
| 550 gal | 417 | 37,900 |
| 1,000 gal | 417 | 37,900 |
| 1,500 gal | 417 | 37,900 |
| 2,500 gal | 417 | 37,900 |
| 5,000 gal | 417 | 37,900 |
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