Lebam, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.2 °C (low) to 15.7 °C (high). Annual precipitation averages 2364.7 Millimeters. Lebam is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.6 °C | 8.7 °C | 369.06 mm |
| February | 1.1 °C | 10.4 °C | 225.55 mm |
| March | 2.1 °C | 12.4 °C | 272.03 mm |
| April | 3.5 °C | 14.6 °C | 189.48 mm |
| May | 6.3 °C | 17.8 °C | 101.85 mm |
| June | 8.5 °C | 19.6 °C | 80.01 mm |
| July | 10.4 °C | 23 °C | 26.67 mm |
| August | 10.5 °C | 23.4 °C | 42.42 mm |
| September | 8.5 °C | 22.1 °C | 89.15 mm |
| October | 5.3 °C | 16.6 °C | 230.12 mm |
| November | 2.7 °C | 11.3 °C | 362.71 mm |
| December | 1.3 °C | 8.3 °C | 375.67 mm |
| Annual | 5.2 °C | 15.7 °C | 2364.72 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 50-75 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 |