| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 46074 - Westfield, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 21 | 30 | 39 | 50 | 60 | 63 | 61 | 53 | 42 | 33 | 23 | 41 |
| Avg Max Temp (°F) | 34 | 39 | 50 | 62 | 73 | 82 | 85 | 83 | 77 | 65 | 51 | 38 | 62 |
| Avg Precip (In.) | 2.15 | 2.12 | 3.07 | 3.72 | 4.16 | 4.07 | 4.39 | 3.78 | 2.93 | 2.74 | 3.36 | 2.85 | 39.33 |