Elk River, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 32.9 °F (low) to 56.7 °F (high). Annual precipitation averages 36.9 Inches. 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 | 21.1 °F | 34.3 °F | 4.64 in. |
| February | 21.8 °F | 39.2 °F | 3.81 in. |
| March | 26.0 °F | 46.1 °F | 3.56 in. |
| April | 31.3 °F | 54.3 °F | 3.18 in. |
| May | 37.8 °F | 64.8 °F | 3.0 in. |
| June | 43.7 °F | 70.9 °F | 2.61 in. |
| July | 47.4 °F | 82.5 °F | 0.9 in. |
| August | 46.0 °F | 83.0 °F | 0.74 in. |
| September | 39.7 °F | 72.8 °F | 1.3 in. |
| October | 32.5 °F | 56.7 °F | 3.19 in. |
| November | 26.8 °F | 41.8 °F | 4.9 in. |
| December | 20.9 °F | 33.6 °F | 5.09 in. |
| Annual | 32.9 °F | 56.7 °F | 36.92 in. |
| 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 : -10°F to -5°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 |