Piltzville, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.5 °C (low) to 14.4 °C (high). Annual precipitation averages 437.9 Millimeters. Piltzville is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.7 °C | 1.2 °C | 29.46 mm |
| February | -6.7 °C | 3.7 °C | 26.67 mm |
| March | -3.4 °C | 9.3 °C | 28.19 mm |
| April | -0.1 °C | 13.8 °C | 44.45 mm |
| May | 3.8 °C | 19.1 °C | 53.59 mm |
| June | 7.4 °C | 22.8 °C | 65.28 mm |
| July | 10.1 °C | 29.5 °C | 21.59 mm |
| August | 9.3 °C | 29.3 °C | 27.18 mm |
| September | 5.2 °C | 23.1 °C | 33.27 mm |
| October | 0.3 °C | 14.3 °C | 35.05 mm |
| November | -4.1 °C | 5.5 °C | 39.62 mm |
| December | -7.6 °C | 0.6 °C | 33.53 mm |
| Annual | 0.5 °C | 14.4 °C | 437.88 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |