Whitlash, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from 31.3 °F (low) to 54.8 °F (high). Annual precipitation averages 16.8 Inches. Whitlash is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Sep.1 - Sep. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.6 °F | 35.4 °F | 0.6 in. |
| February | 14.6 °F | 36.0 °F | 0.49 in. |
| March | 20.9 °F | 42.9 °F | 0.76 in. |
| April | 29.7 °F | 52.2 °F | 1.49 in. |
| May | 38.8 °F | 61.7 °F | 2.42 in. |
| June | 45.5 °F | 69.0 °F | 3.72 in. |
| July | 51.4 °F | 78.9 °F | 1.55 in. |
| August | 50.6 °F | 79.2 °F | 1.66 in. |
| September | 42.8 °F | 68.6 °F | 1.68 in. |
| October | 32.3 °F | 55.0 °F | 1.17 in. |
| November | 21.5 °F | 42.5 °F | 0.71 in. |
| December | 14.6 °F | 35.6 °F | 0.57 in. |
| Annual | 31.3 °F | 54.8 °F | 16.82 in. |
| Average First Frost Date | Sep.1 - Sep. 10 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -30°F to -25°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |