Bonanza, Oregon has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from -0.4 °C (low) to 16.1 °C (high). Annual precipitation averages 308.1 Millimeters. Bonanza is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -6.1 °C | 5.1 °C | 39.88 mm |
| February | -5 °C | 7.4 °C | 32.26 mm |
| March | -3.3 °C | 10.4 °C | 33.02 mm |
| April | -1.8 °C | 13.6 °C | 26.92 mm |
| May | 1.9 °C | 18.8 °C | 31.75 mm |
| June | 4.7 °C | 23.6 °C | 18.03 mm |
| July | 7.9 °C | 29.3 °C | 6.86 mm |
| August | 6.7 °C | 28.7 °C | 6.35 mm |
| September | 2.8 °C | 25.1 °C | 9.65 mm |
| October | -1.5 °C | 17.8 °C | 21.34 mm |
| November | -4.3 °C | 9.4 °C | 33.02 mm |
| December | -6.7 °C | 4.4 °C | 49.02 mm |
| Annual | -0.4 °C | 16.1 °C | 308.1 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |