Miramar, FL rainwater: 53,220 gallons off a roof
Miramar, FL: gallons off the roof each year
53,220gallons a year
That is a 1,500 sq ft asphalt roof under Miramar, FL's normal 67.0 inches of rain, about 795 gallons for every inch that falls.
In Miramar, 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 Miramar 3.0 Wnw station (2.8 mi away). Miramar, FL ranks 18th wettest of the 173 cities covered in Florida.
Month by month in Miramar
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.28 | 1,812 | |
| Feb | 2.57 | 2,043 | |
| Mar | 2.66 | 2,114 | |
| Apr | 3.34 | 2,655 | 126 |
| May | 6.47 | 5,142 | |
| Jun | 9.15 | 7,272 | |
| Jul | 7.36 | 5,850 | |
| Aug | 8.85 | 7,034 | |
| Sep | 9.59 | 7,622 | |
| Oct | 7.68 | 6,104 | |
| Nov | 4.27 | 3,394 | |
| Dec | 2.74 | 2,178 |
Sep is the wettest month (9.59 in, 7,622 gal off the roof); Jan the driest (2.28 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 Miramar
Best fit: one 55-gallon barrel, which delivers about 109 gallons to the garden in a normal year (86.6% of its need).
Before you buy, a 55-gallon barrel with a downspout diverter is the whole job. Check that the overflow points away from your foundation, because most of Miramar's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 109 | 51,866 |
| 110 gal | 109 | 51,866 |
| 165 gal | 109 | 51,866 |
| 275 gal | 109 | 51,866 |
| 550 gal | 109 | 51,866 |
| 1,000 gal | 109 | 51,866 |
| 1,500 gal | 109 | 51,866 |
| 2,500 gal | 109 | 51,866 |
| 5,000 gal | 109 | 51,866 |
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