Monroe, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.2 °F (low) to 60.6 °F (high). Annual precipitation averages 40.6 Inches. Monroe is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.2 °F | 33.1 °F | 2.69 in. |
| February | 20.2 °F | 36.8 °F | 2.27 in. |
| March | 28.6 °F | 47.6 °F | 2.79 in. |
| April | 39.1 °F | 60.8 °F | 3.96 in. |
| May | 50.4 °F | 71.9 °F | 4.53 in. |
| June | 60.4 °F | 80.9 °F | 4.47 in. |
| July | 63.5 °F | 84.4 °F | 4.47 in. |
| August | 61.2 °F | 82.5 °F | 3.92 in. |
| September | 53.7 °F | 76.9 °F | 3.09 in. |
| October | 42.8 °F | 64.5 °F | 2.88 in. |
| November | 32.6 °F | 49.9 °F | 3.01 in. |
| December | 23.9 °F | 38.0 °F | 2.49 in. |
| Annual | 41.2 °F | 60.6 °F | 40.57 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |