Blanchard, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 34.4 °F (low) to 57.2 °F (high). Annual precipitation averages 26.1 Inches. 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 | 22.6 °F | 34.6 °F | 3.34 in. |
| February | 22.8 °F | 39.4 °F | 2.25 in. |
| March | 27.1 °F | 47.6 °F | 2.87 in. |
| April | 32.3 °F | 55.9 °F | 2.07 in. |
| May | 39.6 °F | 65.8 °F | 2.17 in. |
| June | 45.2 °F | 71.9 °F | 1.91 in. |
| July | 49.4 °F | 82.5 °F | 0.65 in. |
| August | 48.6 °F | 82.9 °F | 0.77 in. |
| September | 41.5 °F | 72.5 °F | 0.84 in. |
| October | 33.7 °F | 57.0 °F | 2.08 in. |
| November | 27.9 °F | 42.5 °F | 3.25 in. |
| December | 22.6 °F | 34.1 °F | 3.86 in. |
| Annual | 34.4 °F | 57.2 °F | 26.06 in. |
| 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 : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |