| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 50ac - Onaway Moraines |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49740 - Harbor Springs, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 12 | 21 | 32 | 43 | 53 | 59 | 57 | 50 | 40 | 31 | 21 | 36 |
| Avg Max Temp (°F) | 26 | 28 | 37 | 49 | 61 | 70 | 75 | 74 | 67 | 56 | 43 | 32 | 52 |
| Avg Precip (In.) | 2.08 | 1.26 | 2 | 2.46 | 2.64 | 2.61 | 3.02 | 3.44 | 3.65 | 3.17 | 2.6 | 2.19 | 31.11 |