Conconully, Washington has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 1.7 °C (low) to 14 °C (high). Annual precipitation averages 394.5 Millimeters. Conconully is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.7 °C | -0.1 °C | 39.12 mm |
| February | -7.1 °C | 3.4 °C | 34.54 mm |
| March | -2.6 °C | 8.5 °C | 37.34 mm |
| April | 1.4 °C | 14.1 °C | 24.38 mm |
| May | 5.9 °C | 19.5 °C | 42.93 mm |
| June | 8.9 °C | 23.1 °C | 41.91 mm |
| July | 12.2 °C | 28.5 °C | 22.1 mm |
| August | 12.2 °C | 28.4 °C | 12.95 mm |
| September | 8.2 °C | 23.2 °C | 17.02 mm |
| October | 2.2 °C | 14.1 °C | 29.46 mm |
| November | -3.5 °C | 5.2 °C | 43.43 mm |
| December | -8.2 °C | -0.3 °C | 49.28 mm |
| Annual | 1.7 °C | 14 °C | 394.46 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | Over 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 | Extreme Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |