Colton, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 37.8 °F (low) to 58.6 °F (high). Annual precipitation averages 22.5 Inches. Colton is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.5 °F | 37.7 °F | 2.94 in. |
| February | 27.4 °F | 41.6 °F | 2.14 in. |
| March | 31.4 °F | 48.8 °F | 2.41 in. |
| April | 36.0 °F | 56.2 °F | 2.12 in. |
| May | 42.4 °F | 65.3 °F | 2.0 in. |
| June | 47.1 °F | 71.4 °F | 1.34 in. |
| July | 51.2 °F | 82.9 °F | 0.49 in. |
| August | 51.2 °F | 84.1 °F | 0.54 in. |
| September | 45.4 °F | 74.5 °F | 0.71 in. |
| October | 37.7 °F | 59.4 °F | 1.84 in. |
| November | 31.2 °F | 44.9 °F | 2.82 in. |
| December | 25.7 °F | 36.4 °F | 3.11 in. |
| Annual | 37.8 °F | 58.6 °F | 22.46 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |