Deary, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 1.7 °C (low) to 14.1 °C (high). Annual precipitation averages 836.7 Millimeters. 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 | -4.3 °C | 2.1 °C | 111 mm |
| February | -3.9 °C | 4.4 °C | 86.11 mm |
| March | -1.8 °C | 8.4 °C | 88.65 mm |
| April | 0.8 °C | 12.8 °C | 69.85 mm |
| May | 4.5 °C | 18.4 °C | 71.63 mm |
| June | 7.3 °C | 21.7 °C | 53.34 mm |
| July | 8.7 °C | 28.3 °C | 18.03 mm |
| August | 8.2 °C | 28.8 °C | 18.8 mm |
| September | 4.8 °C | 23.2 °C | 26.42 mm |
| October | 1.8 °C | 14.4 °C | 69.34 mm |
| November | -1.5 °C | 5.9 °C | 105.66 mm |
| December | -4.7 °C | 1.3 °C | 117.86 mm |
| Annual | 1.7 °C | 14.1 °C | 836.69 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |