Juliaetta, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 41.7 °F (low) to 64 °F (high). Annual precipitation averages 21.2 Inches. Juliaetta is located in USDA Plant Hardiness Zone 7b. 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 | 29.8 °F | 41.1 °F | 2.26 in. |
| February | 30.8 °F | 46.7 °F | 1.98 in. |
| March | 34.5 °F | 54.8 °F | 2.22 in. |
| April | 39.5 °F | 62.6 °F | 2.17 in. |
| May | 46.0 °F | 71.8 °F | 2.19 in. |
| June | 51.7 °F | 78.3 °F | 1.68 in. |
| July | 57.0 °F | 90.1 °F | 0.59 in. |
| August | 56.7 °F | 90.4 °F | 0.61 in. |
| September | 49.8 °F | 80.1 °F | 0.8 in. |
| October | 41.1 °F | 63.8 °F | 1.73 in. |
| November | 34.4 °F | 48.7 °F | 2.39 in. |
| December | 29.2 °F | 39.7 °F | 2.58 in. |
| Annual | 41.7 °F | 64 °F | 21.2 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |