Winifred, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.9 °F (low) to 57.3 °F (high). Annual precipitation averages 16 Inches. 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 | 11.2 °F | 33.8 °F | 0.65 in. |
| February | 14.0 °F | 36.4 °F | 0.39 in. |
| March | 21.9 °F | 45.8 °F | 0.61 in. |
| April | 30.6 °F | 55.4 °F | 1.58 in. |
| May | 39.8 °F | 64.5 °F | 2.76 in. |
| June | 48.2 °F | 73.2 °F | 3.18 in. |
| July | 54.2 °F | 84.0 °F | 1.71 in. |
| August | 52.6 °F | 83.8 °F | 1.38 in. |
| September | 43.2 °F | 72.5 °F | 1.39 in. |
| October | 32.1 °F | 58.0 °F | 1.23 in. |
| November | 21.7 °F | 44.7 °F | 0.63 in. |
| December | 13.3 °F | 35.3 °F | 0.53 in. |
| Annual | 31.9 °F | 57.3 °F | 16.04 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |