Jacksonville Beach, FL rainwater: 41,680 gallons off a roof
Rainwater from a roof in Jacksonville Beach, FL
41,680gallons a year
That is a 1,500 sq ft asphalt roof under Jacksonville Beach, FL's normal 52.4 inches of rain, about 795 gallons for every inch that falls.
In Jacksonville Beach, 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 Jacksonville Beach station (1.1 mi away). Jacksonville Beach, FL ranks 140th wettest of the 173 cities covered in Florida.
Month by month in Jacksonville Beach
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.50 | 2,782 | |
| Feb | 2.82 | 2,241 | |
| Mar | 3.21 | 2,551 | |
| Apr | 3.01 | 2,392 | 167 |
| May | 2.93 | 2,329 | 177 |
| Jun | 6.79 | 5,397 | |
| Jul | 4.90 | 3,895 | |
| Aug | 7.54 | 5,993 | |
| Sep | 7.19 | 5,715 | |
| Oct | 5.10 | 4,054 | |
| Nov | 2.50 | 1,987 | |
| Dec | 2.95 | 2,345 |
Aug is the wettest month (7.54 in, 5,993 gal off the roof); Nov the driest (2.50 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 Jacksonville Beach
Best fit: one 55-gallon barrel, which delivers about 299 gallons to the garden in a normal year (86.9% 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 Jacksonville Beach's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 299 | 40,256 |
| 110 gal | 299 | 40,256 |
| 165 gal | 299 | 40,256 |
| 275 gal | 299 | 40,256 |
| 550 gal | 299 | 40,256 |
| 1,000 gal | 299 | 40,256 |
| 1,500 gal | 299 | 40,256 |
| 2,500 gal | 299 | 40,256 |
| 5,000 gal | 299 | 40,256 |
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