Coolin, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 32.5 °F (low) to 56.4 °F (high). Annual precipitation averages 30.5 Inches. Coolin is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.8 °F | 32.9 °F | 3.78 in. |
| February | 20.8 °F | 38.4 °F | 2.47 in. |
| March | 25.3 °F | 46.5 °F | 3.23 in. |
| April | 30.3 °F | 55.8 °F | 2.35 in. |
| May | 37.6 °F | 66.2 °F | 2.55 in. |
| June | 43.5 °F | 72.0 °F | 2.55 in. |
| July | 47.2 °F | 82.3 °F | 0.98 in. |
| August | 46.0 °F | 82.5 °F | 0.82 in. |
| September | 39.0 °F | 71.9 °F | 1.17 in. |
| October | 31.8 °F | 55.5 °F | 2.57 in. |
| November | 26.4 °F | 40.2 °F | 3.81 in. |
| December | 20.8 °F | 32.5 °F | 4.23 in. |
| Annual | 32.5 °F | 56.4 °F | 30.51 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°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 |