Jefferson City, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.9 °F (low) to 65.9 °F (high). Annual precipitation averages 44.1 Inches. Jefferson City is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.0 °F | 40.4 °F | 2.2 in. |
| February | 25.0 °F | 44.9 °F | 2.2 in. |
| March | 34.1 °F | 55.6 °F | 3.28 in. |
| April | 44.6 °F | 67.1 °F | 4.83 in. |
| May | 55.4 °F | 75.4 °F | 5.1 in. |
| June | 63.7 °F | 83.6 °F | 4.37 in. |
| July | 67.9 °F | 87.9 °F | 4.6 in. |
| August | 65.7 °F | 87.0 °F | 3.91 in. |
| September | 56.8 °F | 80.3 °F | 4.34 in. |
| October | 44.9 °F | 68.5 °F | 3.58 in. |
| November | 33.9 °F | 55.8 °F | 3.27 in. |
| December | 25.1 °F | 44.3 °F | 2.44 in. |
| Annual | 44.9 °F | 65.9 °F | 44.12 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |