Drummond, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -2.8 °C (low) to 13.8 °C (high). Annual precipitation averages 310.7 Millimeters. Drummond is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -11.6 °C | -0.1 °C | 18.8 mm |
| February | -10.4 °C | 2.7 °C | 16 mm |
| March | -6.6 °C | 8.2 °C | 16.26 mm |
| April | -3.1 °C | 13.5 °C | 24.64 mm |
| May | 0.9 °C | 18.8 °C | 41.4 mm |
| June | 4.6 °C | 22.9 °C | 51.82 mm |
| July | 6.7 °C | 29.1 °C | 23.88 mm |
| August | 5.7 °C | 28.9 °C | 23.88 mm |
| September | 1.8 °C | 23.1 °C | 26.42 mm |
| October | -2.8 °C | 14.2 °C | 22.35 mm |
| November | -7.4 °C | 4.7 °C | 22.86 mm |
| December | -11.3 °C | -0.8 °C | 22.35 mm |
| Annual | -2.8 °C | 13.8 °C | 310.66 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |