Kerby, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 4.5 °C (low) to 20.6 °C (high). Annual precipitation averages 1364.5 Millimeters. Kerby is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.3 °C | 9.4 °C | 244.86 mm |
| February | 0.6 °C | 12.6 °C | 185.42 mm |
| March | 1.3 °C | 15.2 °C | 192.79 mm |
| April | 2.8 °C | 18.4 °C | 107.95 mm |
| May | 5.7 °C | 23.4 °C | 53.09 mm |
| June | 8.4 °C | 27.8 °C | 20.07 mm |
| July | 11.2 °C | 33.7 °C | 7.87 mm |
| August | 10.1 °C | 33.4 °C | 5.08 mm |
| September | 7.2 °C | 30 °C | 16.26 mm |
| October | 3.8 °C | 21.9 °C | 89.41 mm |
| November | 2.2 °C | 12.8 °C | 201.93 mm |
| December | 0.6 °C | 8.4 °C | 239.78 mm |
| Annual | 4.5 °C | 20.6 °C | 1364.51 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |