Tower, Minnesota has a Humid Continental Mild Summer With Dry Winters climate (Köppen classification: Dwb). Average annual temperatures range from 26.4 °F (low) to 48.8 °F (high). Annual precipitation averages 27.2 Inches. Tower is located in USDA Plant Hardiness Zone 3a. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.6 °F | 16.6 °F | 0.94 in. |
| February | -2.9 °F | 22.5 °F | 0.73 in. |
| March | 10.8 °F | 35.7 °F | 1.01 in. |
| April | 24.9 °F | 49.0 °F | 1.95 in. |
| May | 38.1 °F | 63.1 °F | 3.06 in. |
| June | 48.7 °F | 72.6 °F | 3.61 in. |
| July | 53.2 °F | 77.3 °F | 4.14 in. |
| August | 51.1 °F | 75.5 °F | 3.14 in. |
| September | 43.6 °F | 66.5 °F | 3.33 in. |
| October | 32.1 °F | 51.1 °F | 2.83 in. |
| November | 18.7 °F | 34.3 °F | 1.41 in. |
| December | 4.4 °F | 21.8 °F | 1.05 in. |
| Annual | 26.4 °F | 48.8 °F | 27.2 in. |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 3a : -40°F to -35°F |
| Plant Hardiness Zone - 2012 | Zone 3a : -40°F to -35°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dwb - Humid Continental Mild Summer With Dry Winters |