Pennock, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.8 °C (low) to 11.8 °C (high). Annual precipitation averages 731.3 Millimeters. Pennock is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -16.1 °C | -6.2 °C | 18.29 mm |
| February | -14.2 °C | -3.6 °C | 19.81 mm |
| March | -6.9 °C | 3.3 °C | 37.34 mm |
| April | 0.5 °C | 12.2 °C | 63.75 mm |
| May | 7.7 °C | 19.8 °C | 84.07 mm |
| June | 13.8 °C | 25.1 °C | 116.08 mm |
| July | 16.1 °C | 27.3 °C | 102.11 mm |
| August | 14.4 °C | 26.1 °C | 99.06 mm |
| September | 9.6 °C | 22.3 °C | 73.41 mm |
| October | 2.3 °C | 14.1 °C | 62.23 mm |
| November | -5 °C | 4.6 °C | 31.5 mm |
| December | -12.1 °C | -3.2 °C | 23.62 mm |
| Annual | 0.8 °C | 11.8 °C | 731.27 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |