New Ulm, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.3 °F (low) to 54.8 °F (high). Annual precipitation averages 31.1 Inches. New Ulm is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.5 °F | 22.9 °F | 0.77 in. |
| February | 9.6 °F | 27.8 °F | 0.84 in. |
| March | 22.1 °F | 40.1 °F | 1.69 in. |
| April | 34.8 °F | 56.1 °F | 2.86 in. |
| May | 47.1 °F | 68.5 °F | 4.18 in. |
| June | 57.9 °F | 78.3 °F | 5.09 in. |
| July | 61.9 °F | 81.6 °F | 3.68 in. |
| August | 59.0 °F | 79.4 °F | 3.83 in. |
| September | 50.5 °F | 73.1 °F | 3.22 in. |
| October | 38.0 °F | 59.4 °F | 2.49 in. |
| November | 24.6 °F | 42.5 °F | 1.4 in. |
| December | 12.5 °F | 28.4 °F | 1.06 in. |
| Annual | 35.3 °F | 54.8 °F | 31.11 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |