Mirrormont, Washington has a Temperate Oceanic Climate climate (Köppen classification: Cfb). Average annual temperatures range from 42.3 °F (low) to 59.1 °F (high). Annual precipitation averages 58.2 Inches. Mirrormont is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 34.2 °F | 44.8 °F | 7.61 in. |
| February | 34.2 °F | 47.4 °F | 5.52 in. |
| March | 36.2 °F | 51.5 °F | 6.25 in. |
| April | 39.4 °F | 57.2 °F | 5.38 in. |
| May | 45.0 °F | 64.7 °F | 3.37 in. |
| June | 49.2 °F | 68.8 °F | 2.95 in. |
| July | 53.1 °F | 75.6 °F | 1.28 in. |
| August | 53.3 °F | 76.5 °F | 1.62 in. |
| September | 49.3 °F | 70.3 °F | 2.75 in. |
| October | 42.9 °F | 59.2 °F | 5.8 in. |
| November | 37.5 °F | 49.5 °F | 8.29 in. |
| December | 33.5 °F | 43.6 °F | 7.37 in. |
| Annual | 42.3 °F | 59.1 °F | 58.19 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfb - Temperate Oceanic Climate |