| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 56b - Elkhart Till Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 46563 - Plymouth, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 19 | 29 | 38 | 49 | 58 | 62 | 60 | 53 | 42 | 32 | 22 | 40 |
| Avg Max Temp (°F) | 32 | 37 | 49 | 61 | 73 | 82 | 85 | 83 | 76 | 64 | 50 | 37 | 61 |
| Avg Precip (In.) | 2.12 | 1.84 | 2.82 | 3.87 | 4.14 | 4.46 | 3.79 | 3.44 | 3.56 | 3.16 | 3.18 | 2.77 | 39.15 |