| 2023 Hardiness Zone: | Zone 6b: -5°F to 0°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 6a: -10F to -5F |
| Average First Frost Date: | Oct. 21 - Oct. 31 |
| Average Last Frost Date: | Apr. 11 - Apr. 20 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 72f - River Hills |
| Heat Zone Days: | 61 - 90 days Over 86°F |
Annual Climate Data for ZIP Code 65109 - Jefferson City, MO | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 22 | 32 | 42 | 52 | 61 | 66 | 64 | 55 | 43 | 32 | 22 | 42 |
| Avg Max Temp (°F) | 39 | 45 | 56 | 67 | 75 | 84 | 89 | 88 | 80 | 69 | 55 | 43 | 66 |
| Avg Precip (In.) | 1.64 | 2.01 | 3.21 | 3.77 | 4.92 | 4.12 | 3.75 | 3.48 | 3.59 | 3.32 | 3.53 | 2.57 | 39.91 |