Kissimmee, FL rainwater: 41,783 gallons off a roof
Kissimmee, FL: gallons off the roof each year
41,783gallons a year
That is a 1,500 sq ft asphalt roof under Kissimmee, FL's normal 52.6 inches of rain, about 795 gallons for every inch that falls.
In Kissimmee, 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 Kissimmee 2 station (1.9 mi away). Kissimmee, FL ranks 137th wettest of the 173 cities covered in Florida.
Month by month in Kissimmee
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 2.67 | 2,122 | |
| Feb | 2.37 | 1,884 | |
| Mar | 3.07 | 2,440 | |
| Apr | 2.43 | 1,931 | 239 |
| May | 4.17 | 3,314 | 22 |
| Jun | 9.18 | 7,296 | |
| Jul | 7.21 | 5,731 | |
| Aug | 8.38 | 6,660 | |
| Sep | 5.88 | 4,673 | |
| Oct | 3.07 | 2,440 | 160 |
| Nov | 1.99 | 1,582 | |
| Dec | 2.15 | 1,709 |
Jun is the wettest month (9.18 in, 7,296 gal off the roof); Nov the driest (1.99 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 Kissimmee
Best fit: one 55-gallon barrel, which delivers about 353 gallons to the garden in a normal year (83.8% 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 Kissimmee's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 353 | 40,200 |
| 110 gal | 354 | 40,199 |
| 165 gal | 354 | 40,199 |
| 275 gal | 354 | 40,199 |
| 550 gal | 354 | 40,199 |
| 1,000 gal | 354 | 40,199 |
| 1,500 gal | 354 | 40,199 |
| 2,500 gal | 354 | 40,199 |
| 5,000 gal | 354 | 40,199 |
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