Farmington, Missouri has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.2 °C (low) to 19.1 °C (high). Annual precipitation averages 1131.3 Millimeters. 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 | -5.1 °C | 5.5 °C | 64.77 mm |
| February | -3.4 °C | 8.3 °C | 63.25 mm |
| March | 1.2 °C | 13.7 °C | 96.27 mm |
| April | 6.8 °C | 19.8 °C | 140.72 mm |
| May | 12.4 °C | 24.2 °C | 136.4 mm |
| June | 16.9 °C | 28.6 °C | 92.71 mm |
| July | 19.3 °C | 30.8 °C | 103.12 mm |
| August | 18.2 °C | 30.4 °C | 90.42 mm |
| September | 13.7 °C | 26.7 °C | 79.25 mm |
| October | 7.4 °C | 20.6 °C | 87.12 mm |
| November | 1.6 °C | 13.3 °C | 99.06 mm |
| December | -2.8 °C | 7.2 °C | 78.23 mm |
| Annual | 7.2 °C | 19.1 °C | 1131.32 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |