Ukiah, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from -0.6 °C (low) to 15.2 °C (high). Annual precipitation averages 414.3 Millimeters. Ukiah is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.7 °C | 4 °C | 41.91 mm |
| February | -5.8 °C | 6.4 °C | 32.51 mm |
| March | -3.7 °C | 10.1 °C | 35.31 mm |
| April | -1.2 °C | 13.2 °C | 40.13 mm |
| May | 1.9 °C | 17.9 °C | 50.8 mm |
| June | 4.7 °C | 22.1 °C | 37.59 mm |
| July | 6.9 °C | 28.4 °C | 12.45 mm |
| August | 6.1 °C | 28.6 °C | 12.7 mm |
| September | 2.4 °C | 23.9 °C | 14.73 mm |
| October | -1.2 °C | 16.3 °C | 35.56 mm |
| November | -3.8 °C | 8.3 °C | 47.24 mm |
| December | -6.6 °C | 3.3 °C | 53.34 mm |
| Annual | -0.6 °C | 15.2 °C | 414.27 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |