Farmington, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 9.2 °C (low) to 23.5 °C (high). Annual precipitation averages 410.5 Millimeters. Farmington is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.7 °C | 12.9 °C | 77.22 mm |
| February | 4.9 °C | 16.1 °C | 67.56 mm |
| March | 6.4 °C | 19.1 °C | 61.47 mm |
| April | 8 °C | 21.6 °C | 36.32 mm |
| May | 10.9 °C | 26.4 °C | 22.1 mm |
| June | 13.4 °C | 30.9 °C | 4.83 mm |
| July | 15.3 °C | 33.9 °C | 0.51 mm |
| August | 15 °C | 33.2 °C | 1.52 mm |
| September | 13.5 °C | 31 °C | 2.03 mm |
| October | 9.8 °C | 25.7 °C | 18.54 mm |
| November | 5.8 °C | 18.4 °C | 41.66 mm |
| December | 3.3 °C | 13.3 °C | 76.71 mm |
| Annual | 9.2 °C | 23.5 °C | 410.47 mm |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |