Rudyard, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1.3 °C (low) to 13.4 °C (high). Annual precipitation averages 281.2 Millimeters. Rudyard is located in USDA Plant Hardiness Zone 4a. 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 °C | -1 °C | 10.16 mm |
| February | -12.2 °C | 1 °C | 6.86 mm |
| March | -7.3 °C | 6.3 °C | 9.4 mm |
| April | -1.5 °C | 13.2 °C | 22.1 mm |
| May | 3.8 °C | 18.8 °C | 43.43 mm |
| June | 8.3 °C | 23.2 °C | 65.02 mm |
| July | 11.3 °C | 28.7 °C | 31.5 mm |
| August | 10.3 °C | 28.4 °C | 26.67 mm |
| September | 5.4 °C | 22.1 °C | 27.18 mm |
| October | -0.9 °C | 14.1 °C | 17.53 mm |
| November | -7 °C | 5.7 °C | 13.21 mm |
| December | -12.1 °C | 0.3 °C | 8.13 mm |
| Annual | -1.3 °C | 13.4 °C | 281.19 mm |
| 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 4a : -34.4°C to -31.7°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 |