Lochsloy, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.8 °C (low) to 15.3 °C (high). Annual precipitation averages 1244.6 Millimeters. Lochsloy is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1 °C | 7.7 °C | 167.89 mm |
| February | 1.1 °C | 9.4 °C | 113.03 mm |
| March | 2.4 °C | 11.7 °C | 131.06 mm |
| April | 4.6 °C | 14.5 °C | 105.16 mm |
| May | 7.7 °C | 18.2 °C | 73.91 mm |
| June | 10.1 °C | 20.4 °C | 72.39 mm |
| July | 11.8 °C | 23.8 °C | 29.72 mm |
| August | 11.8 °C | 24.3 °C | 28.45 mm |
| September | 9.4 °C | 21.2 °C | 67.31 mm |
| October | 5.8 °C | 15.3 °C | 125.22 mm |
| November | 2.9 °C | 10.3 °C | 173.99 mm |
| December | 0.9 °C | 7.2 °C | 156.46 mm |
| Annual | 5.8 °C | 15.3 °C | 1244.59 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°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 |