Altamonte Springs, FL rainwater: 43,770 gallons off a roof
Altamonte Springs, FL: gallons off the roof each year
43,770gallons a year
That is a 1,500 sq ft asphalt roof under Altamonte Springs, FL's normal 55.1 inches of rain, about 795 gallons for every inch that falls.
In Altamonte 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 Orlando 4.9 N station (6.0 mi away). Altamonte Springs, FL ranks 103rd wettest of the 173 cities covered in Florida.
Month by month in Altamonte Springs
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.84 | 2,257 | |
| Feb | 2.33 | 1,852 | |
| Mar | 3.66 | 2,909 | |
| Apr | 2.66 | 2,114 | 211 |
| May | 3.85 | 3,060 | 62 |
| Jun | 8.92 | 7,090 | |
| Jul | 7.68 | 6,104 | |
| Aug | 7.91 | 6,287 | |
| Sep | 7.24 | 5,754 | |
| Oct | 3.61 | 2,869 | 92 |
| Nov | 1.93 | 1,534 | |
| Dec | 2.44 | 1,939 |
Jun is the wettest month (8.92 in, 7,090 gal off the roof); Nov the driest (1.93 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 Altamonte Springs
Best fit: one 55-gallon barrel, which delivers about 312 gallons to the garden in a normal year (85.4% 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 Altamonte Springs's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 312 | 42,303 |
| 110 gal | 312 | 42,303 |
| 165 gal | 312 | 42,303 |
| 275 gal | 312 | 42,303 |
| 550 gal | 312 | 42,303 |
| 1,000 gal | 312 | 42,303 |
| 1,500 gal | 312 | 42,303 |
| 2,500 gal | 312 | 42,303 |
| 5,000 gal | 312 | 42,303 |
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