Klamath, California has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 45.7 °F (low) to 60.7 °F (high). Annual precipitation averages 74.2 Inches. Klamath is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Feb. 1 - Feb. 10 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.8 °F | 54.5 °F | 12.26 in. |
| February | 41.0 °F | 55.7 °F | 9.89 in. |
| March | 41.8 °F | 56.3 °F | 10.07 in. |
| April | 43.4 °F | 58.7 °F | 6.66 in. |
| May | 46.9 °F | 61.8 °F | 3.44 in. |
| June | 49.6 °F | 64.6 °F | 1.52 in. |
| July | 52.3 °F | 66.6 °F | 0.23 in. |
| August | 52.6 °F | 66.8 °F | 0.27 in. |
| September | 50.0 °F | 67.3 °F | 1.31 in. |
| October | 46.8 °F | 64.5 °F | 4.52 in. |
| November | 43.4 °F | 57.8 °F | 9.28 in. |
| December | 40.3 °F | 54.3 °F | 14.7 in. |
| Annual | 45.7 °F | 60.7 °F | 74.15 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Feb. 1 - Feb. 10 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |