| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 47c - Iowan Surface |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 55060 - Owatonna, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 2 | 9 | 22 | 34 | 47 | 57 | 61 | 59 | 49 | 38 | 23 | 9 | 34 |
| Avg Max Temp (°F) | 21 | 28 | 40 | 56 | 69 | 80 | 83 | 80 | 72 | 60 | 40 | 26 | 55 |
| Avg Precip (In.) | .99 | .62 | 1.9 | 2.91 | 3.9 | 4.12 | 4.51 | 4.42 | 3.13 | 2.28 | 1.83 | .98 | 31.6 |