Pierce, Idaho has a Humid Continental Climate - Dry Warm Summer climate (Köppen classification: Dsa). Average annual temperatures range from 31.2 °F (low) to 56.1 °F (high). Annual precipitation averages 46 Inches. Pierce is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.0 °F | 33.6 °F | 5.91 in. |
| February | 20.5 °F | 38.3 °F | 4.47 in. |
| March | 24.2 °F | 45.5 °F | 5.21 in. |
| April | 29.1 °F | 54.0 °F | 4.18 in. |
| May | 36.0 °F | 64.2 °F | 3.72 in. |
| June | 42.2 °F | 70.5 °F | 3.22 in. |
| July | 45.8 °F | 82.0 °F | 1.26 in. |
| August | 44.3 °F | 82.7 °F | 1.1 in. |
| September | 37.6 °F | 72.3 °F | 1.67 in. |
| October | 30.8 °F | 56.9 °F | 3.49 in. |
| November | 25.3 °F | 40.4 °F | 5.77 in. |
| December | 19.1 °F | 32.4 °F | 6.04 in. |
| Annual | 31.2 °F | 56.1 °F | 46.04 in. |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsa - Humid Continental Climate - Dry Warm Summer |