Blanchard, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 1.4 °C (low) to 14 °C (high). Annual precipitation averages 661.9 Millimeters. Blanchard 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 Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.2 °C | 1.4 °C | 84.84 mm |
| February | -5.1 °C | 4.1 °C | 57.15 mm |
| March | -2.7 °C | 8.7 °C | 72.9 mm |
| April | 0.2 °C | 13.3 °C | 52.58 mm |
| May | 4.2 °C | 18.8 °C | 55.12 mm |
| June | 7.3 °C | 22.2 °C | 48.51 mm |
| July | 9.7 °C | 28.1 °C | 16.51 mm |
| August | 9.2 °C | 28.3 °C | 19.56 mm |
| September | 5.3 °C | 22.5 °C | 21.34 mm |
| October | 0.9 °C | 13.9 °C | 52.83 mm |
| November | -2.3 °C | 5.8 °C | 82.55 mm |
| December | -5.2 °C | 1.2 °C | 98.04 mm |
| Annual | 1.4 °C | 14 °C | 661.93 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 |