Monroe, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.9 °F (low) to 56.6 °F (high). Annual precipitation averages 38.8 Inches. Monroe 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 | 11.3 °F | 27.0 °F | 1.53 in. |
| February | 14.7 °F | 31.1 °F | 1.66 in. |
| March | 25.2 °F | 43.4 °F | 2.04 in. |
| April | 36.3 °F | 57.0 °F | 3.85 in. |
| May | 48.1 °F | 68.9 °F | 4.16 in. |
| June | 58.3 °F | 78.7 °F | 5.97 in. |
| July | 62.1 °F | 81.9 °F | 3.99 in. |
| August | 60.2 °F | 80.2 °F | 4.38 in. |
| September | 51.7 °F | 73.1 °F | 4.0 in. |
| October | 39.9 °F | 60.2 °F | 3.14 in. |
| November | 28.9 °F | 45.2 °F | 2.25 in. |
| December | 18.1 °F | 32.4 °F | 1.8 in. |
| Annual | 37.9 °F | 56.6 °F | 38.77 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |