Chemult, Oregon has a Continental Subarctic - Cold Dry Summer climate (Köppen classification: Dsc). Average annual temperatures range from 28.5 °F (low) to 57.4 °F (high). Annual precipitation averages 26.3 Inches. Chemult is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Jun. 21 - Jun. 30 through the first frost around July 21 - July 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.6 °F | 38.8 °F | 4.46 in. |
| February | 19.8 °F | 41.6 °F | 3.34 in. |
| March | 22.7 °F | 46.7 °F | 2.74 in. |
| April | 26.0 °F | 52.2 °F | 1.74 in. |
| May | 31.8 °F | 62.0 °F | 1.5 in. |
| June | 35.9 °F | 70.2 °F | 0.87 in. |
| July | 41.8 °F | 81.6 °F | 0.44 in. |
| August | 40.6 °F | 80.9 °F | 0.52 in. |
| September | 34.6 °F | 73.6 °F | 0.56 in. |
| October | 28.4 °F | 59.8 °F | 1.5 in. |
| November | 23.5 °F | 44.3 °F | 3.31 in. |
| December | 18.1 °F | 36.5 °F | 5.29 in. |
| Annual | 28.5 °F | 57.4 °F | 26.27 in. |
| Average First Frost Date | July 21 - July 31 |
| Average Last Frost Date | Jun. 21 - Jun. 30 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsc - Continental Subarctic - Cold Dry Summer |