Thorp, Washington has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 2.7 °C (low) to 15.1 °C (high). Annual precipitation averages 304.1 Millimeters. Thorp is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 1.8 °C | 44.2 mm |
| February | -3.9 °C | 5.6 °C | 26.16 mm |
| March | -1.5 °C | 10.3 °C | 28.19 mm |
| April | 1.5 °C | 14.8 °C | 21.34 mm |
| May | 5.7 °C | 19.8 °C | 22.35 mm |
| June | 9.2 °C | 23.3 °C | 16.26 mm |
| July | 12.4 °C | 28.7 °C | 8.64 mm |
| August | 12 °C | 28.4 °C | 5.59 mm |
| September | 7.5 °C | 23.7 °C | 11.68 mm |
| October | 2.2 °C | 15.8 °C | 27.18 mm |
| November | -2.2 °C | 7.2 °C | 38.61 mm |
| December | -5.2 °C | 1.7 °C | 53.85 mm |
| Annual | 2.7 °C | 15.1 °C | 304.05 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |