| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| 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: | 56g - Lansing Loamy Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 48879 - Saint Johns, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 15 | 24 | 35 | 46 | 55 | 60 | 57 | 50 | 39 | 30 | 20 | 37 |
| Avg Max Temp (°F) | 29 | 32 | 43 | 56 | 69 | 78 | 83 | 80 | 72 | 60 | 46 | 34 | 57 |
| Avg Precip (In.) | 1.68 | 1.41 | 2.22 | 3.17 | 3.04 | 3.38 | 2.93 | 3.73 | 3.77 | 2.82 | 2.64 | 2 | 32.81 |