| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 56a - Lake Country |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 46784 - Rome City, IN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 17 | 26 | 37 | 48 | 57 | 61 | 59 | 52 | 40 | 31 | 21 | 39 |
| Avg Max Temp (°F) | 30 | 34 | 45 | 58 | 70 | 79 | 83 | 81 | 74 | 62 | 47 | 35 | 58 |
| Avg Precip (In.) | 1.88 | 1.73 | 2.65 | 3.41 | 3.69 | 4.05 | 3.71 | 3.83 | 3.39 | 2.78 | 2.97 | 2.64 | 36.73 |