Hobson, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -0.3 °C (low) to 13.5 °C (high). Annual precipitation averages 367 Millimeters. Hobson is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.6 °C | 2.3 °C | 13.46 mm |
| February | -9.2 °C | 2.8 °C | 12.19 mm |
| March | -5.6 °C | 7.3 °C | 19.81 mm |
| April | -1.4 °C | 11.9 °C | 33.53 mm |
| May | 3.3 °C | 16.9 °C | 58.93 mm |
| June | 7.6 °C | 21.4 °C | 68.07 mm |
| July | 10.7 °C | 27.5 °C | 39.12 mm |
| August | 10.2 °C | 27.3 °C | 36.58 mm |
| September | 5.5 °C | 21.3 °C | 32.77 mm |
| October | -0.1 °C | 13.8 °C | 24.13 mm |
| November | -5.3 °C | 6.8 °C | 15.49 mm |
| December | -9.1 °C | 2.5 °C | 12.95 mm |
| Annual | -0.3 °C | 13.5 °C | 367.03 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |