Spangle, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.1 °C (low) to 14.5 °C (high). Annual precipitation averages 501.4 Millimeters. Spangle is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.3 °C | 2.2 °C | 62.23 mm |
| February | -3.8 °C | 4.6 °C | 43.69 mm |
| March | -1.5 °C | 9.1 °C | 54.86 mm |
| April | 1.1 °C | 13.5 °C | 37.85 mm |
| May | 4.8 °C | 18.7 °C | 45.97 mm |
| June | 7.9 °C | 22.2 °C | 38.1 mm |
| July | 10.3 °C | 28.6 °C | 11.18 mm |
| August | 10.1 °C | 28.8 °C | 12.19 mm |
| September | 5.9 °C | 23.4 °C | 15.75 mm |
| October | 1.4 °C | 15 °C | 40.89 mm |
| November | -1.7 °C | 6.5 °C | 63.5 mm |
| December | -4.6 °C | 1.6 °C | 75.18 mm |
| Annual | 2.1 °C | 14.5 °C | 501.39 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |