Piltzville, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33 °F (low) to 57.8 °F (high). Annual precipitation averages 17.2 Inches. 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 | 18.2 °F | 34.1 °F | 1.16 in. |
| February | 20.0 °F | 38.7 °F | 1.05 in. |
| March | 25.9 °F | 48.7 °F | 1.11 in. |
| April | 31.8 °F | 56.8 °F | 1.75 in. |
| May | 38.8 °F | 66.3 °F | 2.11 in. |
| June | 45.4 °F | 73.1 °F | 2.57 in. |
| July | 50.2 °F | 85.1 °F | 0.85 in. |
| August | 48.8 °F | 84.7 °F | 1.07 in. |
| September | 41.4 °F | 73.6 °F | 1.31 in. |
| October | 32.6 °F | 57.7 °F | 1.38 in. |
| November | 24.6 °F | 41.9 °F | 1.56 in. |
| December | 18.3 °F | 33.1 °F | 1.32 in. |
| Annual | 33 °F | 57.8 °F | 17.24 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |