Two Harbors, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.3 °F (low) to 49.2 °F (high). Annual precipitation averages 31 Inches. Two Harbors 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 | 5.5 °F | 22.5 °F | 1.06 in. |
| February | 7.6 °F | 26.8 °F | 1.05 in. |
| March | 18.5 °F | 35.8 °F | 1.43 in. |
| April | 30.5 °F | 46.4 °F | 2.62 in. |
| May | 39.4 °F | 57.5 °F | 3.25 in. |
| June | 47.5 °F | 66.6 °F | 4.16 in. |
| July | 56.1 °F | 74.8 °F | 3.91 in. |
| August | 56.5 °F | 74.1 °F | 3.54 in. |
| September | 48.9 °F | 66.2 °F | 3.42 in. |
| October | 38.1 °F | 53.2 °F | 3.0 in. |
| November | 25.6 °F | 39.5 °F | 2.05 in. |
| December | 13.1 °F | 27.4 °F | 1.55 in. |
| Annual | 32.3 °F | 49.2 °F | 31.04 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |