Pinesdale, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.5 °F (low) to 57.9 °F (high). Annual precipitation averages 15.3 Inches. 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 | 17.9 °F | 35.5 °F | 1.12 in. |
| February | 19.6 °F | 40.1 °F | 1.16 in. |
| March | 24.7 °F | 48.7 °F | 1.08 in. |
| April | 30.1 °F | 56.5 °F | 1.15 in. |
| May | 36.9 °F | 65.8 °F | 1.74 in. |
| June | 43.3 °F | 73.1 °F | 2.05 in. |
| July | 48.0 °F | 84.5 °F | 0.95 in. |
| August | 46.4 °F | 83.5 °F | 0.88 in. |
| September | 39.4 °F | 72.9 °F | 1.07 in. |
| October | 31.2 °F | 57.7 °F | 1.22 in. |
| November | 23.5 °F | 42.9 °F | 1.52 in. |
| December | 17.5 °F | 33.9 °F | 1.4 in. |
| Annual | 31.5 °F | 57.9 °F | 15.34 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |