Monroe, Georgia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.5 °C (low) to 22.4 °C (high). Annual precipitation averages 1293.6 Millimeters. Monroe is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.6 °C | 11.8 °C | 119.13 mm |
| February | 1.9 °C | 13.8 °C | 117.86 mm |
| March | 5.2 °C | 18.3 °C | 130.56 mm |
| April | 9.6 °C | 22.7 °C | 98.3 mm |
| May | 14.6 °C | 26.7 °C | 78.99 mm |
| June | 19 °C | 30.2 °C | 113.54 mm |
| July | 20.8 °C | 31.8 °C | 97.28 mm |
| August | 20.4 °C | 31.2 °C | 118.11 mm |
| September | 17.1 °C | 28.3 °C | 99.82 mm |
| October | 10.8 °C | 23.1 °C | 88.39 mm |
| November | 4.7 °C | 17.6 °C | 115.82 mm |
| December | 1.8 °C | 13 °C | 115.82 mm |
| Annual | 10.5 °C | 22.4 °C | 1293.62 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |