Fort Klamath, Oregon has a Continental Subarctic - Cold Dry Summer climate (Köppen classification: Dsc). Average annual temperatures range from 30.8 °F (low) to 59.9 °F (high). Annual precipitation averages 19.5 Inches. Fort Klamath 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 | 20.3 °F | 40.1 °F | 3.37 in. |
| February | 22.2 °F | 43.8 °F | 2.15 in. |
| March | 26.1 °F | 49.4 °F | 2.05 in. |
| April | 29.2 °F | 55.2 °F | 1.39 in. |
| May | 34.6 °F | 64.7 °F | 1.33 in. |
| June | 39.0 °F | 73.0 °F | 0.56 in. |
| July | 44.4 °F | 83.5 °F | 0.3 in. |
| August | 42.6 °F | 83.1 °F | 0.3 in. |
| September | 36.4 °F | 76.6 °F | 0.43 in. |
| October | 29.8 °F | 63.0 °F | 1.12 in. |
| November | 25.2 °F | 47.4 °F | 2.56 in. |
| December | 20.2 °F | 39.2 °F | 3.94 in. |
| Annual | 30.8 °F | 59.9 °F | 19.5 in. |
| Average First Frost Date | Aug. 11 - Aug. 20 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsc - Continental Subarctic - Cold Dry Summer |