Clinton, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6.1 °C (low) to 15.2 °C (high). Annual precipitation averages 940.1 Millimeters. 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 | 1.9 °C | 8 °C | 121.92 mm |
| February | 1.8 °C | 9.4 °C | 88.14 mm |
| March | 3 °C | 11.6 °C | 105.92 mm |
| April | 4.8 °C | 14.2 °C | 74.93 mm |
| May | 7.6 °C | 17.7 °C | 56.39 mm |
| June | 9.9 °C | 20.2 °C | 48.01 mm |
| July | 11.4 °C | 23.6 °C | 24.13 mm |
| August | 11.5 °C | 24 °C | 23.37 mm |
| September | 9.6 °C | 20.8 °C | 43.18 mm |
| October | 6.5 °C | 15 °C | 86.61 mm |
| November | 3.7 °C | 10.4 °C | 144.27 mm |
| December | 1.8 °C | 7.6 °C | 123.19 mm |
| Annual | 6.1 °C | 15.2 °C | 940.06 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |