Joplin, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Average annual temperatures range from -1.3 °C (low) to 13.2 °C (high). Annual precipitation averages 272.8 Millimeters. Joplin is located in USDA Plant Hardiness Zone 4a. 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 | -13.2 °C | -0.7 °C | 8.89 mm |
| February | -11.8 °C | 1.1 °C | 7.37 mm |
| March | -7.2 °C | 6.2 °C | 8.89 mm |
| April | -1.7 °C | 12.8 °C | 20.07 mm |
| May | 3.6 °C | 18.4 °C | 40.64 mm |
| June | 8 °C | 22.8 °C | 64.52 mm |
| July | 11.1 °C | 28.2 °C | 29.97 mm |
| August | 10.3 °C | 28.1 °C | 26.67 mm |
| September | 5.4 °C | 22 °C | 27.43 mm |
| October | -0.9 °C | 13.8 °C | 17.02 mm |
| November | -7 °C | 5.4 °C | 13.21 mm |
| December | -11.8 °C | 0.3 °C | 8.13 mm |
| Annual | -1.3 °C | 13.2 °C | 272.81 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |