Farmington, 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 66.4 °F (high). Annual precipitation averages 44.5 Inches. Farmington 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.8 °F | 41.9 °F | 2.55 in. |
| February | 25.9 °F | 47.0 °F | 2.49 in. |
| March | 34.1 °F | 56.7 °F | 3.79 in. |
| April | 44.3 °F | 67.6 °F | 5.54 in. |
| May | 54.3 °F | 75.5 °F | 5.37 in. |
| June | 62.4 °F | 83.5 °F | 3.65 in. |
| July | 66.7 °F | 87.4 °F | 4.06 in. |
| August | 64.8 °F | 86.8 °F | 3.56 in. |
| September | 56.7 °F | 80.0 °F | 3.12 in. |
| October | 45.3 °F | 69.1 °F | 3.43 in. |
| November | 34.8 °F | 55.9 °F | 3.9 in. |
| December | 26.9 °F | 45.0 °F | 3.08 in. |
| Annual | 44.9 °F | 66.4 °F | 44.54 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |