Churchill, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 30.7 °F (low) to 57.1 °F (high). Annual precipitation averages 14.7 Inches. Churchill is located in USDA Plant Hardiness Zone 5a. 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 | 13.9 °F | 34.4 °F | 0.52 in. |
| February | 15.9 °F | 37.3 °F | 0.53 in. |
| March | 22.7 °F | 46.6 °F | 0.89 in. |
| April | 29.5 °F | 54.8 °F | 1.71 in. |
| May | 37.7 °F | 64.1 °F | 2.36 in. |
| June | 44.5 °F | 72.8 °F | 2.66 in. |
| July | 50.0 °F | 84.0 °F | 1.21 in. |
| August | 48.0 °F | 83.3 °F | 1.05 in. |
| September | 40.7 °F | 72.6 °F | 1.21 in. |
| October | 31.0 °F | 57.8 °F | 1.23 in. |
| November | 21.3 °F | 43.4 °F | 0.76 in. |
| December | 13.6 °F | 33.9 °F | 0.6 in. |
| Annual | 30.7 °F | 57.1 °F | 14.73 in. |
| 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |