Colton, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 3.2 °C (low) to 14.8 °C (high). Annual precipitation averages 570.5 Millimeters. 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 | -3.1 °C | 3.2 °C | 74.68 mm |
| February | -2.6 °C | 5.3 °C | 54.36 mm |
| March | -0.3 °C | 9.3 °C | 61.21 mm |
| April | 2.2 °C | 13.4 °C | 53.85 mm |
| May | 5.8 °C | 18.5 °C | 50.8 mm |
| June | 8.4 °C | 21.9 °C | 34.04 mm |
| July | 10.7 °C | 28.3 °C | 12.45 mm |
| August | 10.7 °C | 28.9 °C | 13.72 mm |
| September | 7.4 °C | 23.6 °C | 18.03 mm |
| October | 3.2 °C | 15.2 °C | 46.74 mm |
| November | -0.4 °C | 7.2 °C | 71.63 mm |
| December | -3.5 °C | 2.4 °C | 78.99 mm |
| Annual | 3.2 °C | 14.8 °C | 570.5 mm |
| 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 : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |