Pennock, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.5 °F (low) to 53.3 °F (high). Annual precipitation averages 28.8 Inches. 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 | 3.1 °F | 20.9 °F | 0.72 in. |
| February | 6.4 °F | 25.5 °F | 0.78 in. |
| March | 19.5 °F | 38.0 °F | 1.47 in. |
| April | 32.9 °F | 53.9 °F | 2.51 in. |
| May | 45.9 °F | 67.7 °F | 3.31 in. |
| June | 56.9 °F | 77.2 °F | 4.57 in. |
| July | 60.9 °F | 81.1 °F | 4.02 in. |
| August | 58.0 °F | 78.9 °F | 3.9 in. |
| September | 49.3 °F | 72.1 °F | 2.89 in. |
| October | 36.2 °F | 57.3 °F | 2.45 in. |
| November | 23.0 °F | 40.3 °F | 1.24 in. |
| December | 10.3 °F | 26.3 °F | 0.93 in. |
| Annual | 33.5 °F | 53.3 °F | 28.79 in. |
| 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 : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |