Warrenton, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.4 °F (low) to 65.1 °F (high). Annual precipitation averages 43.5 Inches. Warrenton 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 | 20.9 °F | 39.0 °F | 2.47 in. |
| February | 24.0 °F | 44.4 °F | 2.51 in. |
| March | 32.8 °F | 54.5 °F | 3.13 in. |
| April | 43.7 °F | 66.9 °F | 4.67 in. |
| May | 53.8 °F | 75.1 °F | 5.15 in. |
| June | 63.4 °F | 83.3 °F | 4.76 in. |
| July | 66.8 °F | 87.3 °F | 4.36 in. |
| August | 65.0 °F | 86.2 °F | 3.82 in. |
| September | 56.8 °F | 79.3 °F | 3.33 in. |
| October | 45.7 °F | 67.8 °F | 3.41 in. |
| November | 34.4 °F | 54.7 °F | 3.34 in. |
| December | 25.6 °F | 42.7 °F | 2.54 in. |
| Annual | 44.4 °F | 65.1 °F | 43.49 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 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 |