Clinton, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 43 °F (low) to 59.4 °F (high). Annual precipitation averages 37 Inches. Clinton is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 35.4 °F | 46.4 °F | 4.8 in. |
| February | 35.3 °F | 49.0 °F | 3.47 in. |
| March | 37.4 °F | 52.9 °F | 4.17 in. |
| April | 40.7 °F | 57.5 °F | 2.95 in. |
| May | 45.6 °F | 63.8 °F | 2.22 in. |
| June | 49.8 °F | 68.4 °F | 1.89 in. |
| July | 52.6 °F | 74.4 °F | 0.95 in. |
| August | 52.7 °F | 75.2 °F | 0.92 in. |
| September | 49.3 °F | 69.4 °F | 1.7 in. |
| October | 43.7 °F | 59.0 °F | 3.41 in. |
| November | 38.6 °F | 50.8 °F | 5.68 in. |
| December | 35.2 °F | 45.6 °F | 4.85 in. |
| Annual | 43 °F | 59.4 °F | 37.01 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 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 | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |