Green Cove Springs, FL rainwater: 42,180 gallons off a roof
Green Cove Springs, FL: gallons off the roof each year
42,180gallons a year
That is a 1,500 sq ft asphalt roof under Green Cove Springs, FL's normal 53.1 inches of rain, about 795 gallons for every inch that falls.
In Green Cove Springs, 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 Fleming Island 2.2 S station (5.6 mi away). Green Cove Springs, FL ranks 132nd wettest of the 173 cities covered in Florida.
Month by month in Green Cove Springs
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 3.41 | 2,710 | |
| Feb | 3.00 | 2,384 | |
| Mar | 3.22 | 2,559 | |
| Apr | 2.85 | 2,265 | 187 |
| May | 3.41 | 2,710 | 117 |
| Jun | 7.30 | 5,802 | |
| Jul | 7.22 | 5,738 | |
| Aug | 6.97 | 5,540 | |
| Sep | 7.04 | 5,595 | |
| Oct | 3.96 | 3,147 | 49 |
| Nov | 2.24 | 1,780 | |
| Dec | 2.45 | 1,947 |
Jun is the wettest month (7.30 in, 5,802 gal off the roof); Nov the driest (2.24 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 Green Cove Springs
Best fit: one 55-gallon barrel, which delivers about 301 gallons to the garden in a normal year (85.3% 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 Green Cove Springs's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 301 | 40,739 |
| 110 gal | 301 | 40,739 |
| 165 gal | 301 | 40,739 |
| 275 gal | 301 | 40,739 |
| 550 gal | 301 | 40,739 |
| 1,000 gal | 301 | 40,739 |
| 1,500 gal | 301 | 40,739 |
| 2,500 gal | 301 | 40,739 |
| 5,000 gal | 301 | 40,739 |
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