Trail, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 4.3 °C (low) to 19.7 °C (high). Annual precipitation averages 772.2 Millimeters. Trail 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 | -0.5 °C | 8.9 °C | 116.33 mm |
| February | -0.1 °C | 11.9 °C | 82.55 mm |
| March | 1.1 °C | 14.6 °C | 80.77 mm |
| April | 2.9 °C | 17.6 °C | 63.75 mm |
| May | 5.9 °C | 22.4 °C | 42.67 mm |
| June | 8.4 °C | 26.5 °C | 27.18 mm |
| July | 11.3 °C | 32.2 °C | 9.65 mm |
| August | 10.8 °C | 32.3 °C | 8.89 mm |
| September | 7.5 °C | 28.9 °C | 17.78 mm |
| October | 3.6 °C | 21.2 °C | 56.39 mm |
| November | 1.4 °C | 12.3 °C | 115.57 mm |
| December | -0.6 °C | 8.1 °C | 150.62 mm |
| Annual | 4.3 °C | 19.7 °C | 772.15 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |