Boardman, Oregon has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 5.2 °C (low) to 18.7 °C (high). Annual precipitation averages 206.2 Millimeters. Boardman is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -1.9 °C | 5.4 °C | 31.75 mm |
| February | -1.7 °C | 8.9 °C | 20.57 mm |
| March | 0.8 °C | 14.1 °C | 16.26 mm |
| April | 4.1 °C | 18.6 °C | 14.48 mm |
| May | 8.2 °C | 23.7 °C | 19.81 mm |
| June | 11.7 °C | 27.3 °C | 12.95 mm |
| July | 14.7 °C | 32.7 °C | 3.56 mm |
| August | 14.1 °C | 32.1 °C | 5.08 mm |
| September | 9.5 °C | 26.9 °C | 6.6 mm |
| October | 4.4 °C | 18.8 °C | 17.78 mm |
| November | 0.5 °C | 10.4 °C | 24.13 mm |
| December | -1.8 °C | 5.2 °C | 33.27 mm |
| Annual | 5.2 °C | 18.7 °C | 206.24 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |