Davenport, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 1.5 °C (low) to 14.2 °C (high). Annual precipitation averages 360.4 Millimeters. Davenport is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.6 °C | 0.6 °C | 42.67 mm |
| February | -4.8 °C | 3.7 °C | 25.91 mm |
| March | -2.1 °C | 8.9 °C | 38.86 mm |
| April | 0.3 °C | 13.7 °C | 28.45 mm |
| May | 4.5 °C | 19.1 °C | 35.56 mm |
| June | 7.3 °C | 22.7 °C | 30.99 mm |
| July | 10.4 °C | 28.7 °C | 10.92 mm |
| August | 10.1 °C | 28.6 °C | 8.13 mm |
| September | 5.9 °C | 23.2 °C | 12.7 mm |
| October | 0.9 °C | 14.6 °C | 31.75 mm |
| November | -2.8 °C | 5.8 °C | 43.94 mm |
| December | -5.8 °C | 0.4 °C | 50.55 mm |
| Annual | 1.5 °C | 14.2 °C | 360.43 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |