Detroit, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 39 °F (low) to 60.7 °F (high). Annual precipitation averages 79.9 Inches. Detroit is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 30.5 °F | 42.9 °F | 11.91 in. |
| February | 31.0 °F | 46.9 °F | 9.04 in. |
| March | 32.8 °F | 51.6 °F | 8.79 in. |
| April | 36.0 °F | 57.4 °F | 6.51 in. |
| May | 41.6 °F | 65.9 °F | 4.36 in. |
| June | 46.2 °F | 71.7 °F | 2.79 in. |
| July | 50.2 °F | 81.8 °F | 0.5 in. |
| August | 49.9 °F | 82.8 °F | 0.67 in. |
| September | 45.4 °F | 75.4 °F | 2.29 in. |
| October | 39.7 °F | 61.6 °F | 6.64 in. |
| November | 34.3 °F | 48.8 °F | 12.51 in. |
| December | 30.6 °F | 41.7 °F | 13.86 in. |
| Annual | 39 °F | 60.7 °F | 79.87 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |