Conway, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 6 °C (low) to 15 °C (high). Annual precipitation averages 829.3 Millimeters. Conway is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.8 °C | 8.1 °C | 103.63 mm |
| February | 1.7 °C | 9.1 °C | 75.69 mm |
| March | 3.1 °C | 11.3 °C | 82.55 mm |
| April | 4.9 °C | 14.1 °C | 72.9 mm |
| May | 7.6 °C | 17.7 °C | 58.42 mm |
| June | 9.8 °C | 19.9 °C | 42.67 mm |
| July | 11.1 °C | 22.8 °C | 23.62 mm |
| August | 11 °C | 23.4 °C | 26.16 mm |
| September | 9.2 °C | 20.3 °C | 44.45 mm |
| October | 6.1 °C | 15 °C | 80.01 mm |
| November | 3.7 °C | 10.6 °C | 122.43 mm |
| December | 1.6 °C | 7.4 °C | 96.77 mm |
| Annual | 6 °C | 15 °C | 829.3 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 |