Hilger, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.2 °F (low) to 55.8 °F (high). Annual precipitation averages 17.4 Inches. Hilger is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.6 °F | 34.8 °F | 0.61 in. |
| February | 14.3 °F | 36.3 °F | 0.57 in. |
| March | 21.3 °F | 44.7 °F | 0.83 in. |
| April | 29.4 °F | 52.6 °F | 1.77 in. |
| May | 37.9 °F | 61.8 °F | 2.81 in. |
| June | 46.0 °F | 71.4 °F | 3.4 in. |
| July | 51.8 °F | 81.1 °F | 1.8 in. |
| August | 50.5 °F | 80.9 °F | 1.58 in. |
| September | 42.1 °F | 70.1 °F | 1.42 in. |
| October | 31.6 °F | 56.0 °F | 1.23 in. |
| November | 21.8 °F | 44.0 °F | 0.73 in. |
| December | 14.5 °F | 35.8 °F | 0.61 in. |
| Annual | 31.2 °F | 55.8 °F | 17.36 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |