Ladysmith, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 32.1 °F (low) to 53.3 °F (high). Annual precipitation averages 33.2 Inches. Ladysmith 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 | 3.1 °F | 22.7 °F | 1.14 in. |
| February | 5.5 °F | 27.8 °F | 1.03 in. |
| March | 18.0 °F | 39.7 °F | 1.66 in. |
| April | 31.2 °F | 53.9 °F | 3.05 in. |
| May | 43.3 °F | 67.1 °F | 3.96 in. |
| June | 53.3 °F | 76.0 °F | 4.68 in. |
| July | 57.6 °F | 79.9 °F | 3.84 in. |
| August | 55.0 °F | 78.0 °F | 4.02 in. |
| September | 47.3 °F | 70.3 °F | 3.36 in. |
| October | 35.5 °F | 56.4 °F | 3.25 in. |
| November | 23.8 °F | 40.4 °F | 1.75 in. |
| December | 11.3 °F | 27.9 °F | 1.42 in. |
| Annual | 32.1 °F | 53.3 °F | 33.16 in. |
| 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 : -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 |