Winifred, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.1 °C (low) to 14.1 °C (high). Annual precipitation averages 407.4 Millimeters. Winifred 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 | 1 °C | 16.51 mm |
| February | -10 °C | 2.4 °C | 9.91 mm |
| March | -5.6 °C | 7.7 °C | 15.49 mm |
| April | -0.8 °C | 13 °C | 40.13 mm |
| May | 4.3 °C | 18.1 °C | 70.1 mm |
| June | 9 °C | 22.9 °C | 80.77 mm |
| July | 12.3 °C | 28.9 °C | 43.43 mm |
| August | 11.4 °C | 28.8 °C | 35.05 mm |
| September | 6.2 °C | 22.5 °C | 35.31 mm |
| October | 0.1 °C | 14.4 °C | 31.24 mm |
| November | -5.7 °C | 7.1 °C | 16 mm |
| December | -10.4 °C | 1.8 °C | 13.46 mm |
| Annual | -0.1 °C | 14.1 °C | 407.4 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| 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 |