Terrebonne, Oregon has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 33.8 °F (low) to 62.5 °F (high). Annual precipitation averages 8.8 Inches. Terrebonne is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.9 °F | 43.3 °F | 0.91 in. |
| February | 25.3 °F | 46.9 °F | 0.94 in. |
| March | 27.6 °F | 53.7 °F | 0.64 in. |
| April | 30.5 °F | 59.1 °F | 0.8 in. |
| May | 37.0 °F | 67.9 °F | 1.03 in. |
| June | 42.1 °F | 75.3 °F | 0.57 in. |
| July | 47.4 °F | 85.7 °F | 0.38 in. |
| August | 46.7 °F | 85.4 °F | 0.31 in. |
| September | 40.3 °F | 77.1 °F | 0.32 in. |
| October | 33.0 °F | 63.8 °F | 0.69 in. |
| November | 27.8 °F | 50.2 °F | 0.93 in. |
| December | 23.5 °F | 41.9 °F | 1.23 in. |
| Annual | 33.8 °F | 62.5 °F | 8.75 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |