Porter, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 34.6 °F (low) to 55.2 °F (high). Annual precipitation averages 27.5 Inches. 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 | 5.1 °F | 23.3 °F | 0.68 in. |
| February | 9.0 °F | 27.8 °F | 0.76 in. |
| March | 21.1 °F | 39.7 °F | 1.56 in. |
| April | 33.4 °F | 55.4 °F | 2.75 in. |
| May | 46.4 °F | 68.7 °F | 3.39 in. |
| June | 57.4 °F | 78.8 °F | 4.23 in. |
| July | 61.2 °F | 83.3 °F | 3.46 in. |
| August | 58.5 °F | 80.8 °F | 3.32 in. |
| September | 49.9 °F | 73.9 °F | 3.0 in. |
| October | 36.8 °F | 59.5 °F | 2.14 in. |
| November | 23.9 °F | 42.4 °F | 1.19 in. |
| December | 11.9 °F | 28.5 °F | 0.99 in. |
| Annual | 34.6 °F | 55.2 °F | 27.47 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 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |