Lake McMurray, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 42.2 °F (low) to 59.3 °F (high). Annual precipitation averages 47.1 Inches. Lake McMurray is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.5 °F | 45.4 °F | 5.95 in. |
| February | 33.4 °F | 48.0 °F | 3.68 in. |
| March | 36.0 °F | 52.2 °F | 4.96 in. |
| April | 40.3 °F | 57.9 °F | 3.61 in. |
| May | 45.3 °F | 64.6 °F | 3.46 in. |
| June | 49.7 °F | 68.4 °F | 2.46 in. |
| July | 52.9 °F | 74.6 °F | 1.37 in. |
| August | 53.3 °F | 75.7 °F | 1.48 in. |
| September | 49.2 °F | 70.3 °F | 2.44 in. |
| October | 42.2 °F | 59.7 °F | 4.82 in. |
| November | 36.9 °F | 50.1 °F | 7.0 in. |
| December | 33.2 °F | 44.4 °F | 5.85 in. |
| Annual | 42.2 °F | 59.3 °F | 47.08 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |