Philipsburg, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.8 °C (low) to 12.2 °C (high). Annual precipitation averages 398.8 Millimeters. 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 | -10.1 °C | 0.9 °C | 16.76 mm |
| February | -9.9 °C | 2.2 °C | 18.54 mm |
| March | -6.7 °C | 6.4 °C | 24.38 mm |
| April | -3.7 °C | 10.3 °C | 40.13 mm |
| May | 0.1 °C | 15.7 °C | 65.28 mm |
| June | 3.6 °C | 19.9 °C | 69.09 mm |
| July | 6.1 °C | 26.3 °C | 32 mm |
| August | 5.2 °C | 26.1 °C | 26.92 mm |
| September | 1.9 °C | 20.5 °C | 31.75 mm |
| October | -2.4 °C | 12.7 °C | 29.97 mm |
| November | -6.9 °C | 4.7 °C | 24.13 mm |
| December | -10.6 °C | 0.1 °C | 19.81 mm |
| Annual | -2.8 °C | 12.2 °C | 398.76 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |