Crow Agency, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.5 °C (low) to 16.9 °C (high). Annual precipitation averages 452.4 Millimeters. Crow Agency is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.5 °C | 2.4 °C | 19.81 mm |
| February | -9.7 °C | 4.7 °C | 20.57 mm |
| March | -4.7 °C | 10.8 °C | 35.56 mm |
| April | 0.1 °C | 16.3 °C | 51.05 mm |
| May | 5.2 °C | 21.3 °C | 74.68 mm |
| June | 10.1 °C | 26.9 °C | 57.91 mm |
| July | 13.2 °C | 32.3 °C | 35.05 mm |
| August | 11.8 °C | 31.8 °C | 22.1 mm |
| September | 6.9 °C | 26.1 °C | 45.97 mm |
| October | 0.4 °C | 17.6 °C | 44.7 mm |
| November | -5.5 °C | 9.1 °C | 28.7 mm |
| December | -10.7 °C | 3.1 °C | 16.26 mm |
| Annual | 0.5 °C | 16.9 °C | 452.36 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 1 - May 10 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |