Cayuse, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 4.2 °C (low) to 17.7 °C (high). Annual precipitation averages 471.4 Millimeters. Cayuse is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.3 °C | 5.6 °C | 54.1 mm |
| February | -1.5 °C | 8.3 °C | 42.93 mm |
| March | 0.8 °C | 12.9 °C | 52.58 mm |
| April | 3.1 °C | 16.6 °C | 48.26 mm |
| May | 6.7 °C | 21.4 °C | 51.31 mm |
| June | 9.8 °C | 25.5 °C | 34.8 mm |
| July | 12.7 °C | 31.6 °C | 7.87 mm |
| August | 12.3 °C | 31.2 °C | 10.67 mm |
| September | 8.2 °C | 25.8 °C | 14.73 mm |
| October | 3.4 °C | 18.1 °C | 34.29 mm |
| November | 0 °C | 10.1 °C | 58.42 mm |
| December | -2.4 °C | 5.2 °C | 61.47 mm |
| Annual | 4.2 °C | 17.7 °C | 471.43 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |