Knapp, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.2 °C (low) to 12.3 °C (high). Annual precipitation averages 870.5 Millimeters. Knapp 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 | -14.9 °C | -5.1 °C | 25.65 mm |
| February | -13.2 °C | -2.3 °C | 26.42 mm |
| March | -6.4 °C | 4.6 °C | 47.5 mm |
| April | 0.7 °C | 12.8 °C | 77.47 mm |
| May | 7.6 °C | 19.9 °C | 106.93 mm |
| June | 13.3 °C | 25 °C | 129.54 mm |
| July | 15.6 °C | 27.3 °C | 102.87 mm |
| August | 14.3 °C | 26.3 °C | 111.51 mm |
| September | 9.8 °C | 22.1 °C | 91.44 mm |
| October | 2.8 °C | 14.3 °C | 70.61 mm |
| November | -3.9 °C | 5.3 °C | 45.21 mm |
| December | -10.8 °C | -2.2 °C | 35.31 mm |
| Annual | 1.2 °C | 12.3 °C | 870.46 mm |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |