| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | Apr. 21 - Apr. 30 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 39c - White River Hills |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 65656 - Galena, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 21 | 25 | 34 | 43 | 53 | 61 | 66 | 64 | 56 | 45 | 34 | 25 | 44 |
| Avg Max Temp (°F) | 43 | 49 | 59 | 68 | 75 | 83 | 88 | 88 | 80 | 70 | 57 | 46 | 67 |
| Avg Precip (In.) | 2.2 | 2.4 | 4.08 | 4.33 | 4.58 | 4.72 | 3.78 | 3.18 | 4.56 | 3.44 | 4.72 | 3.37 | 45.36 |