Philipsburg, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 27 °F (low) to 53.9 °F (high). Annual precipitation averages 15.7 Inches. Philipsburg is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 1 - Aug. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.9 °F | 33.6 °F | 0.66 in. |
| February | 14.1 °F | 35.9 °F | 0.73 in. |
| March | 19.9 °F | 43.5 °F | 0.96 in. |
| April | 25.3 °F | 50.6 °F | 1.58 in. |
| May | 32.1 °F | 60.2 °F | 2.57 in. |
| June | 38.4 °F | 67.8 °F | 2.72 in. |
| July | 43.0 °F | 79.4 °F | 1.26 in. |
| August | 41.4 °F | 79.0 °F | 1.06 in. |
| September | 35.4 °F | 68.9 °F | 1.25 in. |
| October | 27.6 °F | 54.8 °F | 1.18 in. |
| November | 19.5 °F | 40.5 °F | 0.95 in. |
| December | 12.9 °F | 32.1 °F | 0.78 in. |
| Annual | 27 °F | 53.9 °F | 15.7 in. |
| Average First Frost Date | Aug. 1 - Aug. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |