Trempealeau, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3 °C (low) to 13.5 °C (high). Annual precipitation averages 899.7 Millimeters. Trempealeau 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 | -13.1 °C | -3.5 °C | 27.69 mm |
| February | -11.1 °C | -0.9 °C | 28.19 mm |
| March | -4.5 °C | 6 °C | 47.24 mm |
| April | 2.5 °C | 14.1 °C | 95.76 mm |
| May | 9.2 °C | 20.8 °C | 113.79 mm |
| June | 14.9 °C | 26.1 °C | 120.9 mm |
| July | 17.2 °C | 28.1 °C | 110.74 mm |
| August | 16.1 °C | 27 °C | 108.71 mm |
| September | 11.5 °C | 22.9 °C | 99.31 mm |
| October | 4.6 °C | 15.4 °C | 67.82 mm |
| November | -2.1 °C | 6.6 °C | 46.23 mm |
| December | -8.9 °C | -0.6 °C | 33.27 mm |
| Annual | 3 °C | 13.5 °C | 899.65 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |