Kingston, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 44.2 °F (low) to 59.6 °F (high). Annual precipitation averages 35.5 Inches. Kingston is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 36.5 °F | 46.9 °F | 5.2 in. |
| February | 36.5 °F | 49.3 °F | 3.23 in. |
| March | 38.6 °F | 53.3 °F | 3.66 in. |
| April | 41.6 °F | 57.9 °F | 2.44 in. |
| May | 46.5 °F | 64.2 °F | 2.08 in. |
| June | 50.7 °F | 68.5 °F | 1.68 in. |
| July | 53.8 °F | 74.0 °F | 0.84 in. |
| August | 54.2 °F | 74.8 °F | 0.97 in. |
| September | 50.9 °F | 69.2 °F | 1.51 in. |
| October | 45.4 °F | 59.7 °F | 3.31 in. |
| November | 39.9 °F | 51.2 °F | 5.27 in. |
| December | 36.3 °F | 46.1 °F | 5.32 in. |
| Annual | 44.2 °F | 59.6 °F | 35.51 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°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 |