Farmington, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.9 °F (low) to 54.9 °F (high). Annual precipitation averages 33.4 Inches. Farmington is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.7 °F | 23.3 °F | 0.89 in. |
| February | 9.8 °F | 28.1 °F | 0.92 in. |
| March | 22.1 °F | 40.5 °F | 1.71 in. |
| April | 35.3 °F | 55.7 °F | 2.97 in. |
| May | 47.9 °F | 68.3 °F | 4.26 in. |
| June | 58.4 °F | 78.0 °F | 5.09 in. |
| July | 62.3 °F | 82.1 °F | 4.06 in. |
| August | 59.8 °F | 80.0 °F | 4.67 in. |
| September | 51.3 °F | 72.9 °F | 3.38 in. |
| October | 38.4 °F | 58.7 °F | 2.58 in. |
| November | 25.7 °F | 42.2 °F | 1.67 in. |
| December | 13.2 °F | 28.6 °F | 1.24 in. |
| Annual | 35.9 °F | 54.9 °F | 33.44 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |