Jardine, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.9 °C (low) to 11.3 °C (high). Annual precipitation averages 410.7 Millimeters. Jardine is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.9 °C | -1.2 °C | 29.97 mm |
| February | -11.4 °C | 0.6 °C | 27.43 mm |
| March | -7.6 °C | 5.1 °C | 32.77 mm |
| April | -4.1 °C | 9.7 °C | 34.8 mm |
| May | 0.4 °C | 15.1 °C | 49.28 mm |
| June | 4.4 °C | 20.5 °C | 51.82 mm |
| July | 7.7 °C | 26.4 °C | 28.96 mm |
| August | 6.9 °C | 25.9 °C | 24.89 mm |
| September | 2.9 °C | 20.3 °C | 34.54 mm |
| October | -2.4 °C | 11.7 °C | 33.27 mm |
| November | -8.1 °C | 3.1 °C | 33.53 mm |
| December | -12.1 °C | -1.8 °C | 29.46 mm |
| Annual | -2.9 °C | 11.3 °C | 410.72 mm |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |