Monona, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.5 °F (low) to 56.5 °F (high). Annual precipitation averages 37.7 Inches. Monona is located in USDA Plant Hardiness Zone 5b. 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 | 10.9 °F | 27.0 °F | 1.53 in. |
| February | 13.8 °F | 31.0 °F | 1.6 in. |
| March | 24.3 °F | 43.2 °F | 2.12 in. |
| April | 35.9 °F | 56.8 °F | 3.73 in. |
| May | 47.7 °F | 68.8 °F | 4.4 in. |
| June | 57.7 °F | 78.3 °F | 5.58 in. |
| July | 61.9 °F | 82.0 °F | 4.41 in. |
| August | 60.0 °F | 80.2 °F | 4.08 in. |
| September | 51.4 °F | 73.1 °F | 3.48 in. |
| October | 39.7 °F | 60.2 °F | 2.85 in. |
| November | 28.4 °F | 45.2 °F | 2.21 in. |
| December | 17.9 °F | 32.6 °F | 1.73 in. |
| Annual | 37.5 °F | 56.5 °F | 37.72 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |