Lodge Grass, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.6 °F (low) to 60.9 °F (high). Annual precipitation averages 16.3 Inches. Lodge Grass is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.9 °F | 36.0 °F | 0.65 in. |
| February | 13.5 °F | 39.4 °F | 0.73 in. |
| March | 22.2 °F | 50.0 °F | 1.08 in. |
| April | 30.9 °F | 59.1 °F | 1.88 in. |
| May | 40.0 °F | 68.2 °F | 3.05 in. |
| June | 48.6 °F | 78.5 °F | 1.9 in. |
| July | 54.1 °F | 88.8 °F | 1.42 in. |
| August | 51.6 °F | 87.9 °F | 0.93 in. |
| September | 43.0 °F | 77.1 °F | 1.41 in. |
| October | 31.5 °F | 61.7 °F | 1.68 in. |
| November | 20.9 °F | 47.4 °F | 0.95 in. |
| December | 12.1 °F | 37.2 °F | 0.61 in. |
| Annual | 31.6 °F | 60.9 °F | 16.29 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 |