Terrebonne, Oregon has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.1 °C (low) to 17 °C (high). Annual precipitation averages 222.3 Millimeters. 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 | -3.9 °C | 6.3 °C | 23.11 mm |
| February | -3.7 °C | 8.3 °C | 23.88 mm |
| March | -2.4 °C | 12.1 °C | 16.26 mm |
| April | -0.8 °C | 15.1 °C | 20.32 mm |
| May | 2.8 °C | 19.9 °C | 26.16 mm |
| June | 5.6 °C | 24.1 °C | 14.48 mm |
| July | 8.6 °C | 29.8 °C | 9.65 mm |
| August | 8.2 °C | 29.7 °C | 7.87 mm |
| September | 4.6 °C | 25.1 °C | 8.13 mm |
| October | 0.6 °C | 17.7 °C | 17.53 mm |
| November | -2.3 °C | 10.1 °C | 23.62 mm |
| December | -4.7 °C | 5.5 °C | 31.24 mm |
| Annual | 1.1 °C | 17 °C | 222.25 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |