Pryor, Montana has a Cold Semi-Arid Climate climate (Köppen classification: BSk). Annual precipitation averages 398.3 Millimeters. Pryor is located in USDA Plant Hardiness Zone 5a. 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 | -9.9 °C | 2.8 °C | 12.45 mm |
| February | -9.6 °C | 4 °C | 13.97 mm |
| March | -4.7 °C | 9.6 °C | 30.99 mm |
| April | -0.8 °C | 13.7 °C | 41.4 mm |
| May | 4.3 °C | 18.8 °C | 73.91 mm |
| June | 8.6 °C | 24.3 °C | 55.12 mm |
| July | 11.9 °C | 30.1 °C | 30.99 mm |
| August | 10.4 °C | 29.4 °C | 22.86 mm |
| September | 5.9 °C | 23.4 °C | 35.31 mm |
| October | -0.1 °C | 15.3 °C | 47.5 mm |
| November | -5.7 °C | 8.1 °C | 19.81 mm |
| December | -9.8 °C | 2.5 °C | 13.97 mm |
| Annual | 0 °C | 15.2 °C | 398.28 mm |
| 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | BSk - Cold Semi-Arid Climate |