| 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 Zone 4a: -30°F to -25°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: | 50z - Rudyard Clay Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49783 - Sault Sainte Marie, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 7 | 16 | 29 | 39 | 47 | 52 | 53 | 45 | 36 | 26 | 13 | 31 |
| Avg Max Temp (°F) | 22 | 25 | 34 | 48 | 63 | 71 | 76 | 74 | 65 | 53 | 39 | 27 | 50 |
| Avg Precip (In.) | 2.56 | 1.54 | 2.35 | 2.5 | 2.49 | 3.01 | 3.11 | 3.44 | 3.68 | 3.26 | 3.29 | 2.81 | 34.04 |