Columbia City, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.5 °C (low) to 17.3 °C (high). Annual precipitation averages 1152.7 Millimeters. Columbia City 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 | 8.1 °C | 161.04 mm |
| February | 1.7 °C | 10.3 °C | 120.4 mm |
| March | 3.3 °C | 13.1 °C | 122.68 mm |
| April | 4.9 °C | 16.3 °C | 96.52 mm |
| May | 8.1 °C | 20.3 °C | 69.85 mm |
| June | 10.4 °C | 22.9 °C | 46.74 mm |
| July | 12.8 °C | 27.3 °C | 9.91 mm |
| August | 12.8 °C | 27.9 °C | 19.56 mm |
| September | 10.2 °C | 24.6 °C | 46.23 mm |
| October | 6.6 °C | 17.6 °C | 99.57 mm |
| November | 3.7 °C | 11.4 °C | 169.42 mm |
| December | 1.6 °C | 7.7 °C | 190.75 mm |
| Annual | 6.5 °C | 17.3 °C | 1152.67 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 | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |