Deary, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 35 °F (low) to 57.5 °F (high). Annual precipitation averages 32.9 Inches. Deary is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.3 °F | 35.7 °F | 4.37 in. |
| February | 24.9 °F | 39.9 °F | 3.39 in. |
| March | 28.7 °F | 47.1 °F | 3.49 in. |
| April | 33.4 °F | 55.1 °F | 2.75 in. |
| May | 40.1 °F | 65.2 °F | 2.82 in. |
| June | 45.2 °F | 71.1 °F | 2.1 in. |
| July | 47.7 °F | 82.9 °F | 0.71 in. |
| August | 46.8 °F | 83.8 °F | 0.74 in. |
| September | 40.7 °F | 73.8 °F | 1.04 in. |
| October | 35.3 °F | 58.0 °F | 2.73 in. |
| November | 29.3 °F | 42.7 °F | 4.16 in. |
| December | 23.6 °F | 34.4 °F | 4.64 in. |
| Annual | 35 °F | 57.5 °F | 32.94 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | Jun. 1 - Jun. 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 | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |