Lyle, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.5 °F (low) to 63.8 °F (high). Annual precipitation averages 21 Inches. Lyle 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.0 °F | 42.4 °F | 3.61 in. |
| February | 31.8 °F | 48.4 °F | 1.97 in. |
| March | 35.5 °F | 55.8 °F | 2.05 in. |
| April | 40.4 °F | 62.5 °F | 1.28 in. |
| May | 46.9 °F | 71.2 °F | 1.03 in. |
| June | 52.2 °F | 76.9 °F | 0.68 in. |
| July | 57.4 °F | 85.6 °F | 0.18 in. |
| August | 57.2 °F | 86.0 °F | 0.29 in. |
| September | 49.9 °F | 78.9 °F | 0.56 in. |
| October | 41.8 °F | 65.6 °F | 1.56 in. |
| November | 35.0 °F | 50.8 °F | 3.29 in. |
| December | 31.2 °F | 42.0 °F | 4.46 in. |
| Annual | 42.5 °F | 63.8 °F | 20.96 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |