Trail, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 39.8 °F (low) to 67.5 °F (high). Annual precipitation averages 30.4 Inches. 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 | 31.1 °F | 48.1 °F | 4.58 in. |
| February | 31.8 °F | 53.5 °F | 3.25 in. |
| March | 34.0 °F | 58.2 °F | 3.18 in. |
| April | 37.3 °F | 63.6 °F | 2.51 in. |
| May | 42.7 °F | 72.4 °F | 1.68 in. |
| June | 47.2 °F | 79.7 °F | 1.07 in. |
| July | 52.4 °F | 89.9 °F | 0.38 in. |
| August | 51.4 °F | 90.1 °F | 0.35 in. |
| September | 45.5 °F | 84.0 °F | 0.7 in. |
| October | 38.4 °F | 70.2 °F | 2.22 in. |
| November | 34.5 °F | 54.2 °F | 4.55 in. |
| December | 31.0 °F | 46.5 °F | 5.93 in. |
| Annual | 39.8 °F | 67.5 °F | 30.4 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |