Post Falls, Idaho has a Humid Continental Climate - Dry Cool Summer climate (Köppen classification: Dsb). Average annual temperatures range from 37 °F (low) to 58.4 °F (high). Annual precipitation averages 22.4 Inches. Post Falls 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.8 °F | 35.9 °F | 2.65 in. |
| February | 24.9 °F | 40.3 °F | 1.71 in. |
| March | 29.2 °F | 48.7 °F | 2.31 in. |
| April | 34.4 °F | 56.8 °F | 1.68 in. |
| May | 42.0 °F | 66.7 °F | 2.12 in. |
| June | 47.8 °F | 72.8 °F | 1.94 in. |
| July | 52.8 °F | 83.6 °F | 0.53 in. |
| August | 52.3 °F | 84.0 °F | 0.86 in. |
| September | 44.7 °F | 74.0 °F | 0.8 in. |
| October | 36.2 °F | 58.6 °F | 1.77 in. |
| November | 29.9 °F | 43.8 °F | 3.09 in. |
| December | 24.7 °F | 35.2 °F | 2.98 in. |
| Annual | 37 °F | 58.4 °F | 22.44 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| 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 |