Dayville, Oregon has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 37.4 °F (low) to 66 °F (high). Annual precipitation averages 12.5 Inches. 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 | 26.8 °F | 45.5 °F | 1.18 in. |
| February | 28.0 °F | 49.6 °F | 0.78 in. |
| March | 31.3 °F | 56.3 °F | 1.09 in. |
| April | 35.2 °F | 63.2 °F | 1.39 in. |
| May | 41.4 °F | 72.2 °F | 2.01 in. |
| June | 46.9 °F | 80.2 °F | 1.48 in. |
| July | 52.3 °F | 90.9 °F | 0.45 in. |
| August | 50.6 °F | 90.3 °F | 0.37 in. |
| September | 43.8 °F | 81.2 °F | 0.37 in. |
| October | 36.1 °F | 67.1 °F | 1.06 in. |
| November | 30.2 °F | 52.1 °F | 1.09 in. |
| December | 25.8 °F | 43.6 °F | 1.21 in. |
| Annual | 37.4 °F | 66 °F | 12.48 in. |
| 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 : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |