Pinesdale, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.3 °C (low) to 14.4 °C (high). Annual precipitation averages 389.6 Millimeters. Pinesdale is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.8 °C | 1.9 °C | 28.45 mm |
| February | -6.9 °C | 4.5 °C | 29.46 mm |
| March | -4.1 °C | 9.3 °C | 27.43 mm |
| April | -1.1 °C | 13.6 °C | 29.21 mm |
| May | 2.7 °C | 18.8 °C | 44.2 mm |
| June | 6.3 °C | 22.8 °C | 52.07 mm |
| July | 8.9 °C | 29.2 °C | 24.13 mm |
| August | 8 °C | 28.6 °C | 22.35 mm |
| September | 4.1 °C | 22.7 °C | 27.18 mm |
| October | -0.4 °C | 14.3 °C | 30.99 mm |
| November | -4.7 °C | 6.1 °C | 38.61 mm |
| December | -8.1 °C | 1.1 °C | 35.56 mm |
| Annual | -0.3 °C | 14.4 °C | 389.64 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |