| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50a - Lake Superior Lacustrine Clay Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49953 - Ontonagon, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 7 | 17 | 28 | 39 | 48 | 53 | 53 | 45 | 38 | 26 | 14 | 31 |
| Avg Max Temp (°F) | 22 | 27 | 36 | 49 | 63 | 72 | 76 | 76 | 67 | 58 | 41 | 29 | 51 |
| Avg Precip (In.) | 2.33 | 1.34 | 2.19 | 2.06 | 3.02 | 3.54 | 3.78 | 3.68 | 3.65 | 2.89 | 2.68 | 2.2 | 33.35 |