Hammond, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.9 °C (low) to 12.7 °C (high). Annual precipitation averages 892.6 Millimeters. Hammond 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 Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -14.3 °C | -4.7 °C | 24.64 mm |
| February | -12.3 °C | -2.1 °C | 25.4 mm |
| March | -5.4 °C | 4.8 °C | 48.51 mm |
| April | 1.5 °C | 13.2 °C | 84.58 mm |
| May | 8.2 °C | 20.2 °C | 114.55 mm |
| June | 14 °C | 25.6 °C | 133.86 mm |
| July | 16.2 °C | 27.7 °C | 108.2 mm |
| August | 14.8 °C | 26.4 °C | 120.4 mm |
| September | 10.4 °C | 22.6 °C | 94.49 mm |
| October | 3.3 °C | 14.9 °C | 63.5 mm |
| November | -3.4 °C | 5.8 °C | 43.43 mm |
| December | -10.1 °C | -1.6 °C | 30.99 mm |
| Annual | 1.9 °C | 12.7 °C | 892.55 mm |
| 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |