Niagara, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.1 °F (low) to 53 °F (high). Annual precipitation averages 30.3 Inches. Niagara is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.1 °F | 23.8 °F | 1.33 in. |
| February | 5.9 °F | 27.8 °F | 1.16 in. |
| March | 15.9 °F | 38.7 °F | 1.61 in. |
| April | 28.3 °F | 51.5 °F | 2.68 in. |
| May | 40.8 °F | 65.9 °F | 3.17 in. |
| June | 50.9 °F | 75.3 °F | 3.61 in. |
| July | 55.2 °F | 79.8 °F | 3.44 in. |
| August | 53.6 °F | 77.7 °F | 3.04 in. |
| September | 46.0 °F | 69.8 °F | 3.41 in. |
| October | 34.5 °F | 55.5 °F | 3.28 in. |
| November | 24.3 °F | 40.8 °F | 1.89 in. |
| December | 12.7 °F | 28.9 °F | 1.68 in. |
| Annual | 31.1 °F | 53 °F | 30.3 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4a : -30°F to -25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |