Pierce, Idaho has a Humid Continental Climate - Dry Warm Summer climate (Köppen classification: Dsa). Average annual temperatures range from -0.5 °C (low) to 13.4 °C (high). Annual precipitation averages 1169.4 Millimeters. 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 | -7.2 °C | 0.9 °C | 150.11 mm |
| February | -6.4 °C | 3.5 °C | 113.54 mm |
| March | -4.3 °C | 7.5 °C | 132.33 mm |
| April | -1.6 °C | 12.2 °C | 106.17 mm |
| May | 2.2 °C | 17.9 °C | 94.49 mm |
| June | 5.7 °C | 21.4 °C | 81.79 mm |
| July | 7.7 °C | 27.8 °C | 32 mm |
| August | 6.8 °C | 28.2 °C | 27.94 mm |
| September | 3.1 °C | 22.4 °C | 42.42 mm |
| October | -0.7 °C | 13.8 °C | 88.65 mm |
| November | -3.7 °C | 4.7 °C | 146.56 mm |
| December | -7.2 °C | 0.2 °C | 153.42 mm |
| Annual | -0.5 °C | 13.4 °C | 1169.42 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dsa - Humid Continental Climate - Dry Warm Summer |