| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°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: | 55b - Loamy High Lime Till Plains |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 43021 - Galena, OH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 21 | 29 | 39 | 49 | 58 | 62 | 60 | 53 | 41 | 33 | 24 | 41 |
| Avg Max Temp (°F) | 35 | 39 | 50 | 62 | 73 | 81 | 84 | 83 | 77 | 65 | 51 | 40 | 62 |
| Avg Precip (In.) | 2.52 | 2.18 | 2.87 | 3.52 | 4.07 | 4.43 | 4.19 | 3.75 | 3.01 | 2.58 | 3.31 | 2.9 | 39.32 |