Clatskanie, Oregon has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.5 °F (low) to 60.4 °F (high). Annual precipitation averages 55.1 Inches. Clatskanie is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.7 °F | 46.6 °F | 8.31 in. |
| February | 34.2 °F | 50.2 °F | 5.65 in. |
| March | 36.6 °F | 54.3 °F | 6.16 in. |
| April | 39.6 °F | 58.6 °F | 4.35 in. |
| May | 45.0 °F | 64.7 °F | 2.69 in. |
| June | 49.2 °F | 68.6 °F | 1.77 in. |
| July | 53.0 °F | 74.7 °F | 0.59 in. |
| August | 53.0 °F | 76.0 °F | 0.68 in. |
| September | 49.0 °F | 72.1 °F | 2.09 in. |
| October | 42.9 °F | 61.3 °F | 4.69 in. |
| November | 37.9 °F | 51.9 °F | 8.67 in. |
| December | 34.3 °F | 45.8 °F | 9.49 in. |
| Annual | 42.5 °F | 60.4 °F | 55.14 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 |