Chemult, Oregon has a Continental Subarctic - Cold Dry Summer climate (Köppen classification: Dsc). Average annual temperatures range from -2 °C (low) to 14.1 °C (high). Annual precipitation averages 667.3 Millimeters. 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 | -7.4 °C | 3.8 °C | 113.28 mm |
| February | -6.8 °C | 5.3 °C | 84.84 mm |
| March | -5.2 °C | 8.2 °C | 69.6 mm |
| April | -3.3 °C | 11.2 °C | 44.2 mm |
| May | -0.1 °C | 16.7 °C | 38.1 mm |
| June | 2.2 °C | 21.2 °C | 22.1 mm |
| July | 5.4 °C | 27.6 °C | 11.18 mm |
| August | 4.8 °C | 27.2 °C | 13.21 mm |
| September | 1.4 °C | 23.1 °C | 14.22 mm |
| October | -2 °C | 15.4 °C | 38.1 mm |
| November | -4.7 °C | 6.8 °C | 84.07 mm |
| December | -7.7 °C | 2.5 °C | 134.37 mm |
| Annual | -2 °C | 14.1 °C | 667.27 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsc - Continental Subarctic - Cold Dry Summer |