Dallesport, Washington has a Hot-Summer Mediterranean Climate climate (Köppen classification: Csa). Average annual temperatures range from 6.4 °C (low) to 18.3 °C (high). Annual precipitation averages 346.5 Millimeters. Dallesport is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.5 °C | 6 °C | 67.56 mm |
| February | -0.1 °C | 9.4 °C | 31.75 mm |
| March | 2.2 °C | 13.8 °C | 33.78 mm |
| April | 5.1 °C | 17.7 °C | 17.78 mm |
| May | 9 °C | 22.5 °C | 18.8 mm |
| June | 12.3 °C | 25.8 °C | 12.45 mm |
| July | 15.3 °C | 30.7 °C | 4.32 mm |
| August | 15.1 °C | 30.9 °C | 4.32 mm |
| September | 10.7 °C | 26.8 °C | 8.13 mm |
| October | 5.7 °C | 19.2 °C | 25.4 mm |
| November | 1.8 °C | 10.8 °C | 49.53 mm |
| December | -0.4 °C | 5.9 °C | 72.64 mm |
| Annual | 6.4 °C | 18.3 °C | 346.46 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csa - Hot-Summer Mediterranean Climate |