Glacier, Washington has a Warm-Summer Mediterranean Climate climate (Köppen classification: Csb). Average annual temperatures range from 39.3 °F (low) to 56.8 °F (high). Annual precipitation averages 68.7 Inches. 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 | 29.0 °F | 38.8 °F | 9.7 in. |
| February | 30.3 °F | 43.2 °F | 5.93 in. |
| March | 32.3 °F | 48.6 °F | 7.55 in. |
| April | 36.3 °F | 56.3 °F | 4.89 in. |
| May | 42.2 °F | 64.1 °F | 3.56 in. |
| June | 47.7 °F | 68.1 °F | 3.0 in. |
| July | 51.9 °F | 75.5 °F | 1.51 in. |
| August | 52.0 °F | 76.6 °F | 1.86 in. |
| September | 46.4 °F | 69.0 °F | 3.38 in. |
| October | 40.2 °F | 57.7 °F | 7.63 in. |
| November | 34.0 °F | 44.9 °F | 10.52 in. |
| December | 29.4 °F | 38.4 °F | 9.2 in. |
| Annual | 39.3 °F | 56.8 °F | 68.73 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 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Csb - Warm-Summer Mediterranean Climate |