New Brighton, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.5 °C (low) to 12.8 °C (high). Annual precipitation averages 858 Millimeters. New Brighton 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -13.8 °C | -4.8 °C | 24.38 mm |
| February | -12 °C | -2.1 °C | 22.61 mm |
| March | -5.4 °C | 5 °C | 43.43 mm |
| April | 1.9 °C | 13.1 °C | 78.99 mm |
| May | 9 °C | 20.3 °C | 111.51 mm |
| June | 14.7 °C | 25.6 °C | 120.4 mm |
| July | 17.5 °C | 28.2 °C | 111.51 mm |
| August | 16 °C | 26.9 °C | 108.97 mm |
| September | 11.3 °C | 22.7 °C | 88.14 mm |
| October | 3.9 °C | 14.4 °C | 72.14 mm |
| November | -3.1 °C | 5.8 °C | 43.18 mm |
| December | -9.9 °C | -1.8 °C | 32.77 mm |
| Annual | 2.5 °C | 12.8 °C | 858.03 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |