Athol, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 1.1 °C (low) to 13.7 °C (high). Annual precipitation averages 723.4 Millimeters. Athol is located in USDA Plant Hardiness Zone 6b. 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 | -5.4 °C | 1.5 °C | 97.28 mm |
| February | -5.3 °C | 3.7 °C | 56.39 mm |
| March | -3 °C | 8.4 °C | 74.93 mm |
| April | -0.2 °C | 12.9 °C | 56.9 mm |
| May | 3.8 °C | 18.5 °C | 58.42 mm |
| June | 7.1 °C | 21.8 °C | 51.82 mm |
| July | 9.6 °C | 27.7 °C | 18.8 mm |
| August | 9 °C | 28 °C | 24.38 mm |
| September | 5.1 °C | 22.2 °C | 26.16 mm |
| October | 0.7 °C | 13.6 °C | 62.74 mm |
| November | -2.5 °C | 5.7 °C | 91.69 mm |
| December | -5.4 °C | 0.9 °C | 103.89 mm |
| Annual | 1.1 °C | 13.7 °C | 723.4 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |