Dayville, Oregon has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 3 °C (low) to 18.9 °C (high). Annual precipitation averages 317 Millimeters. Dayville 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 | -2.9 °C | 7.5 °C | 29.97 mm |
| February | -2.2 °C | 9.8 °C | 19.81 mm |
| March | -0.4 °C | 13.5 °C | 27.69 mm |
| April | 1.8 °C | 17.3 °C | 35.31 mm |
| May | 5.2 °C | 22.3 °C | 51.05 mm |
| June | 8.3 °C | 26.8 °C | 37.59 mm |
| July | 11.3 °C | 32.7 °C | 11.43 mm |
| August | 10.3 °C | 32.4 °C | 9.4 mm |
| September | 6.6 °C | 27.3 °C | 9.4 mm |
| October | 2.3 °C | 19.5 °C | 26.92 mm |
| November | -1 °C | 11.2 °C | 27.69 mm |
| December | -3.4 °C | 6.4 °C | 30.73 mm |
| Annual | 3 °C | 18.9 °C | 316.99 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 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 | BSk - Cold Semi-Arid Climate |