Kalama, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43 °F (low) to 61.3 °F (high). Annual precipitation averages 48.6 Inches. Kalama is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.8 °F | 46.5 °F | 6.8 in. |
| February | 34.4 °F | 50.3 °F | 4.94 in. |
| March | 37.2 °F | 54.8 °F | 5.19 in. |
| April | 40.4 °F | 59.3 °F | 4.14 in. |
| May | 45.9 °F | 66.1 °F | 2.86 in. |
| June | 49.9 °F | 70.2 °F | 2.05 in. |
| July | 53.8 °F | 76.9 °F | 0.53 in. |
| August | 53.8 °F | 78.2 °F | 0.81 in. |
| September | 49.7 °F | 73.4 °F | 2.0 in. |
| October | 43.5 °F | 61.9 °F | 4.48 in. |
| November | 38.4 °F | 52.2 °F | 7.24 in. |
| December | 34.5 °F | 45.6 °F | 7.58 in. |
| Annual | 43 °F | 61.3 °F | 48.62 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |