McCleary, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 5.3 °C (low) to 16 °C (high). Annual precipitation averages 2133.1 Millimeters. McCleary is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.5 °C | 8 °C | 330.96 mm |
| February | 1 °C | 9.7 °C | 206.5 mm |
| March | 2.1 °C | 12 °C | 233.93 mm |
| April | 3.4 °C | 14.9 °C | 158.24 mm |
| May | 6.6 °C | 18.8 °C | 93.22 mm |
| June | 9.1 °C | 21.3 °C | 63.5 mm |
| July | 11 °C | 24.9 °C | 22.86 mm |
| August | 10.9 °C | 25.3 °C | 40.39 mm |
| September | 8.6 °C | 22.3 °C | 79.25 mm |
| October | 5.4 °C | 16.1 °C | 209.3 mm |
| November | 2.7 °C | 10.7 °C | 354.08 mm |
| December | 1.1 °C | 7.4 °C | 340.87 mm |
| Annual | 5.3 °C | 16 °C | 2133.1 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |