| 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 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 54a - Illinois/Indiana Prairies |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 47978 - Rensselaer, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 18 | 29 | 39 | 50 | 59 | 63 | 61 | 53 | 41 | 32 | 21 | 40 |
| Avg Max Temp (°F) | 31 | 36 | 48 | 60 | 72 | 81 | 85 | 82 | 76 | 64 | 49 | 36 | 60 |
| Avg Precip (In.) | 1.95 | 1.69 | 3.06 | 3.53 | 4.23 | 4.32 | 3.86 | 3.54 | 3.24 | 2.97 | 3.24 | 2.72 | 38.33 |