Glacier, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 4.1 °C (low) to 13.8 °C (high). Annual precipitation averages 1745.7 Millimeters. Glacier is located in USDA Plant Hardiness Zone 8a. 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 | -1.7 °C | 3.8 °C | 246.38 mm |
| February | -0.9 °C | 6.2 °C | 150.62 mm |
| March | 0.2 °C | 9.2 °C | 191.77 mm |
| April | 2.4 °C | 13.5 °C | 124.21 mm |
| May | 5.7 °C | 17.8 °C | 90.42 mm |
| June | 8.7 °C | 20.1 °C | 76.2 mm |
| July | 11.1 °C | 24.2 °C | 38.35 mm |
| August | 11.1 °C | 24.8 °C | 47.24 mm |
| September | 8 °C | 20.6 °C | 85.85 mm |
| October | 4.6 °C | 14.3 °C | 193.8 mm |
| November | 1.1 °C | 7.2 °C | 267.21 mm |
| December | -1.4 °C | 3.6 °C | 233.68 mm |
| Annual | 4.1 °C | 13.8 °C | 1745.73 mm |
| 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |