Bow, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6 °C (low) to 14.8 °C (high). Annual precipitation averages 1007.9 Millimeters. Bow is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.9 °C | 8 °C | 140.72 mm |
| February | 1.8 °C | 9 °C | 84.07 mm |
| March | 3.2 °C | 11.1 °C | 106.68 mm |
| April | 5 °C | 13.8 °C | 79.76 mm |
| May | 7.6 °C | 17.3 °C | 62.23 mm |
| June | 9.8 °C | 19.8 °C | 46.48 mm |
| July | 11.1 °C | 22.6 °C | 25.15 mm |
| August | 11.1 °C | 23.1 °C | 29.72 mm |
| September | 9.2 °C | 20.1 °C | 45.97 mm |
| October | 6.3 °C | 14.8 °C | 109.73 mm |
| November | 3.8 °C | 10.5 °C | 157.99 mm |
| December | 1.7 °C | 7.5 °C | 119.38 mm |
| Annual | 6 °C | 14.8 °C | 1007.88 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 |