| 2023 Hardiness Zone: | Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 48a - Glacial Lake Agassiz Basin | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 56744 - Oslo, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -7 | 1 | 15 | 30 | 43 | 52 | 56 | 54 | 44 | 33 | 17 | 1 | 28 |
| Avg Max Temp (°F) | 13 | 21 | 33 | 52 | 69 | 77 | 81 | 80 | 69 | 55 | 33 | 19 | 50 |
| Avg Precip (In.) | .64 | .53 | .89 | 1.19 | 2.25 | 3.28 | 3.04 | 2.62 | 2.05 | 1.58 | .91 | .52 | 19.5 |