Caroline, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 33.4 °F (low) to 53.7 °F (high). Annual precipitation averages 33.1 Inches. Caroline is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.8 °F | 24.0 °F | 1.22 in. |
| February | 8.4 °F | 28.1 °F | 1.09 in. |
| March | 19.4 °F | 39.8 °F | 1.77 in. |
| April | 31.7 °F | 53.7 °F | 3.09 in. |
| May | 43.9 °F | 66.5 °F | 3.82 in. |
| June | 54.0 °F | 75.9 °F | 4.5 in. |
| July | 57.9 °F | 80.1 °F | 3.87 in. |
| August | 55.9 °F | 78.1 °F | 3.69 in. |
| September | 47.8 °F | 70.4 °F | 3.62 in. |
| October | 36.1 °F | 56.9 °F | 2.96 in. |
| November | 25.3 °F | 42.2 °F | 1.89 in. |
| December | 13.7 °F | 29.2 °F | 1.6 in. |
| Annual | 33.4 °F | 53.7 °F | 33.12 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |