Worthington, MN rainwater: 24,257 gallons off a roof
How much rain a roof in Worthington, MN collects
24,257gallons a year
That is a 1,500 sq ft asphalt roof under Worthington, MN's normal 30.5 inches of rain, about 795 gallons for every inch that falls.
In Worthington, MN 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 Worthington 2 Nne station (1.5 mi away). Worthington, MN ranks 81st wettest of the 103 cities covered in Minnesota.
Month by month in Worthington
| Month | Rain (in) | Off the roof (gal) | Garden shortfall (gal) |
|---|---|---|---|
| Jan | 0.71 | 564 | |
| Feb | 0.82 | 652 | |
| Mar | 1.46 | 1,160 | |
| Apr | 3.07 | 2,440 | 160 |
| May | 4.09 | 3,251 | 32 |
| Jun | 5.24 | 4,165 | |
| Jul | 3.54 | 2,814 | 101 |
| Aug | 3.85 | 3,060 | 62 |
| Sep | 3.21 | 2,551 | 142 |
| Oct | 2.38 | 1,892 | 246 |
| Nov | 1.27 | 1,009 | |
| Dec | 0.88 | 699 |
Jun is the wettest month (5.24 in, 4,165 gal off the roof); Jan the driest (0.71 in). Garden shortfall is what a 200 sq ft vegetable bed needs beyond the rain that lands on it, April to October.
Barrel or cistern in Worthington?
Best fit: one 55-gallon barrel, which delivers about 616 gallons to the garden in a normal year (82.9% 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 Worthington's roof water will pass straight through it.
| Tank | Water used (gal/yr) | Spills over (gal/yr) |
|---|---|---|
| 55 gal | 616 | 22,786 |
| 110 gal | 618 | 22,785 |
| 165 gal | 618 | 22,785 |
| 275 gal | 618 | 22,785 |
| 550 gal | 618 | 22,785 |
| 1,000 gal | 618 | 22,785 |
| 1,500 gal | 618 | 22,785 |
| 2,500 gal | 618 | 22,785 |
| 5,000 gal | 618 | 22,785 |
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 Minnesota?
No statewide rainwater harvesting regulations; check county for local incentives
From the 2015 (Pacific Northwest National Laboratory report 24347); not yet re-checked against current law, so check with your state water agency before building anything large. Source