Prineville, Oregon has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1 °C (low) to 17 °C (high). Annual precipitation averages 257.3 Millimeters. Prineville is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Aug. 11 - Aug. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4 °C | 6.4 °C | 29.21 mm |
| February | -3.8 °C | 8.2 °C | 23.62 mm |
| March | -2.4 °C | 12.1 °C | 20.57 mm |
| April | -0.8 °C | 15.2 °C | 24.13 mm |
| May | 2.8 °C | 19.9 °C | 30.48 mm |
| June | 5.6 °C | 24 °C | 23.88 mm |
| July | 8.6 °C | 29.8 °C | 9.4 mm |
| August | 8.1 °C | 29.6 °C | 6.86 mm |
| September | 4.4 °C | 25.2 °C | 8.64 mm |
| October | 0.4 °C | 17.8 °C | 20.57 mm |
| November | -2.3 °C | 10.2 °C | 27.43 mm |
| December | -4.7 °C | 5.6 °C | 32.51 mm |
| Annual | 1 °C | 17 °C | 257.3 mm |
| Average First Frost Date | Aug. 11 - Aug. 20 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| 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 |