Plummer, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 28.8 °F (low) to 49.2 °F (high). Annual precipitation averages 23.9 Inches. Plummer is located in USDA Plant Hardiness Zone 3b. 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 | -3.9 °F | 14.7 °F | 0.68 in. |
| February | -1.0 °F | 19.4 °F | 0.61 in. |
| March | 13.6 °F | 33.2 °F | 0.88 in. |
| April | 29.0 °F | 50.5 °F | 1.31 in. |
| May | 42.0 °F | 64.9 °F | 3.03 in. |
| June | 53.5 °F | 74.1 °F | 4.03 in. |
| July | 56.8 °F | 78.5 °F | 3.53 in. |
| August | 54.0 °F | 77.8 °F | 3.09 in. |
| September | 45.3 °F | 68.5 °F | 2.85 in. |
| October | 33.2 °F | 52.9 °F | 2.14 in. |
| November | 18.6 °F | 35.0 °F | 0.93 in. |
| December | 4.8 °F | 20.8 °F | 0.82 in. |
| Annual | 28.8 °F | 49.2 °F | 23.9 in. |
| 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 3b : -35°F to -30°F |
| Plant Hardiness Zone - 2012 | Zone 3b : -35°F to -30°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |