Franklin, Wisconsin has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.6 °F (low) to 56.7 °F (high). Annual precipitation averages 37 Inches. Franklin is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.6 °F | 28.7 °F | 1.82 in. |
| February | 15.6 °F | 32.4 °F | 1.72 in. |
| March | 24.8 °F | 43.1 °F | 2.05 in. |
| April | 35.3 °F | 55.5 °F | 4.01 in. |
| May | 46.2 °F | 67.1 °F | 4.28 in. |
| June | 56.3 °F | 77.2 °F | 4.99 in. |
| July | 61.3 °F | 81.8 °F | 3.63 in. |
| August | 59.8 °F | 80.4 °F | 3.82 in. |
| September | 51.5 °F | 73.6 °F | 3.38 in. |
| October | 40.1 °F | 60.7 °F | 2.96 in. |
| November | 29.3 °F | 46.3 °F | 2.23 in. |
| December | 18.9 °F | 34.0 °F | 2.07 in. |
| Annual | 37.6 °F | 56.7 °F | 36.96 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |