| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F Zone 7a: 0°F to 5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Cfa - Humid Subtropical Climate |
| Ecoregion: | 39i - Eastern Ozark Border |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 63025 - Eureka, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 19 | 24 | 33 | 44 | 53 | 63 | 67 | 65 | 57 | 45 | 35 | 24 | 44 |
| Avg Max Temp (°F) | 38 | 45 | 55 | 67 | 76 | 85 | 89 | 87 | 80 | 69 | 55 | 43 | 66 |
| Avg Precip (In.) | 2.35 | 2.25 | 3.66 | 4 | 4.36 | 3.8 | 3.77 | 3.2 | 3.3 | 2.99 | 4.03 | 2.94 | 40.66 |