Elk River, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 0.5 °C (low) to 13.7 °C (high). Annual precipitation averages 937.8 Millimeters. Elk River is located in USDA Plant Hardiness Zone 6a. 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 | -6.1 °C | 1.3 °C | 117.86 mm |
| February | -5.7 °C | 4 °C | 96.77 mm |
| March | -3.3 °C | 7.8 °C | 90.42 mm |
| April | -0.4 °C | 12.4 °C | 80.77 mm |
| May | 3.2 °C | 18.2 °C | 76.2 mm |
| June | 6.5 °C | 21.6 °C | 66.29 mm |
| July | 8.6 °C | 28.1 °C | 22.86 mm |
| August | 7.8 °C | 28.3 °C | 18.8 mm |
| September | 4.3 °C | 22.7 °C | 33.02 mm |
| October | 0.3 °C | 13.7 °C | 81.03 mm |
| November | -2.9 °C | 5.4 °C | 124.46 mm |
| December | -6.2 °C | 0.9 °C | 129.29 mm |
| Annual | 0.5 °C | 13.7 °C | 937.77 mm |
| 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 6a : -23.3°C to -20.6°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 |