Farmington, California has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 48.5 °F (low) to 74.4 °F (high). Annual precipitation averages 16.2 Inches. 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 | 38.6 °F | 55.2 °F | 3.04 in. |
| February | 40.9 °F | 60.9 °F | 2.66 in. |
| March | 43.6 °F | 66.3 °F | 2.42 in. |
| April | 46.4 °F | 70.9 °F | 1.43 in. |
| May | 51.6 °F | 79.6 °F | 0.87 in. |
| June | 56.2 °F | 87.7 °F | 0.19 in. |
| July | 59.6 °F | 93.0 °F | 0.02 in. |
| August | 59.0 °F | 91.8 °F | 0.06 in. |
| September | 56.3 °F | 87.8 °F | 0.08 in. |
| October | 49.7 °F | 78.2 °F | 0.73 in. |
| November | 42.4 °F | 65.2 °F | 1.64 in. |
| December | 37.9 °F | 55.9 °F | 3.02 in. |
| Annual | 48.5 °F | 74.4 °F | 16.16 in. |
| 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 : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |