Rathdrum, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 36.4 °F (low) to 58.1 °F (high). Annual precipitation averages 25.6 Inches. Rathdrum is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.5 °F | 35.7 °F | 3.35 in. |
| February | 24.5 °F | 40.0 °F | 2.12 in. |
| March | 28.9 °F | 48.3 °F | 2.61 in. |
| April | 34.0 °F | 56.5 °F | 2.07 in. |
| May | 41.4 °F | 66.4 °F | 2.11 in. |
| June | 47.1 °F | 72.4 °F | 2.0 in. |
| July | 51.9 °F | 83.2 °F | 0.69 in. |
| August | 51.3 °F | 83.8 °F | 0.73 in. |
| September | 43.9 °F | 73.7 °F | 0.88 in. |
| October | 35.6 °F | 58.2 °F | 2.18 in. |
| November | 29.5 °F | 43.6 °F | 3.2 in. |
| December | 24.2 °F | 35.0 °F | 3.7 in. |
| Annual | 36.4 °F | 58.1 °F | 25.64 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dsb - Humid Continental Climate - Dry Cool Summer |