Dufur, Oregon has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 3.5 °C (low) to 17.2 °C (high). Annual precipitation averages 344.9 Millimeters. Dufur is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.3 °C | 5 °C | 52.07 mm |
| February | -1.6 °C | 7.9 °C | 36.58 mm |
| March | 0.1 °C | 12.2 °C | 29.21 mm |
| April | 2.2 °C | 16.4 °C | 30.48 mm |
| May | 5.4 °C | 21.3 °C | 27.69 mm |
| June | 8.4 °C | 24.8 °C | 16.76 mm |
| July | 11 °C | 30.4 °C | 6.6 mm |
| August | 10.9 °C | 30.2 °C | 7.37 mm |
| September | 7.4 °C | 26.2 °C | 9.91 mm |
| October | 3.2 °C | 17.8 °C | 28.45 mm |
| November | -0.1 °C | 9.2 °C | 42.16 mm |
| December | -2.4 °C | 4.5 °C | 57.66 mm |
| Annual | 3.5 °C | 17.2 °C | 344.94 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |