Corvallis, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.9 °C (low) to 17.5 °C (high). Annual precipitation averages 1047.2 Millimeters. Corvallis is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.7 °C | 8.6 °C | 159 mm |
| February | 1.8 °C | 10.7 °C | 121.92 mm |
| March | 2.9 °C | 13.3 °C | 120.4 mm |
| April | 4.6 °C | 15.9 °C | 82.55 mm |
| May | 7.2 °C | 19.7 °C | 53.34 mm |
| June | 9.4 °C | 22.9 °C | 34.04 mm |
| July | 11.6 °C | 27.7 °C | 8.13 mm |
| August | 11.4 °C | 28.1 °C | 9.65 mm |
| September | 9.2 °C | 24.9 °C | 33.78 mm |
| October | 6 °C | 17.9 °C | 82.8 mm |
| November | 3.6 °C | 11.7 °C | 153.67 mm |
| December | 1.5 °C | 8 °C | 187.96 mm |
| Annual | 5.9 °C | 17.5 °C | 1047.24 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |