Porter, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.4 °C (low) to 12.9 °C (high). Annual precipitation averages 697.7 Millimeters. Porter is located in USDA Plant Hardiness Zone 5a. 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 | -14.9 °C | -4.8 °C | 17.27 mm |
| February | -12.8 °C | -2.3 °C | 19.3 mm |
| March | -6.1 °C | 4.3 °C | 39.62 mm |
| April | 0.8 °C | 13 °C | 69.85 mm |
| May | 8 °C | 20.4 °C | 86.11 mm |
| June | 14.1 °C | 26 °C | 107.44 mm |
| July | 16.2 °C | 28.5 °C | 87.88 mm |
| August | 14.7 °C | 27.1 °C | 84.33 mm |
| September | 9.9 °C | 23.3 °C | 76.2 mm |
| October | 2.7 °C | 15.3 °C | 54.36 mm |
| November | -4.5 °C | 5.8 °C | 30.23 mm |
| December | -11.2 °C | -1.9 °C | 25.15 mm |
| Annual | 1.4 °C | 12.9 °C | 697.74 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |