Monticello, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.5 °C (low) to 25.9 °C (high). Annual precipitation averages 1478.3 Millimeters. Monticello is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.3 °C | 17.2 °C | 121.16 mm |
| February | 5.9 °C | 19.2 °C | 106.17 mm |
| March | 9 °C | 22.8 °C | 132.59 mm |
| April | 12.5 °C | 26.1 °C | 99.31 mm |
| May | 16.8 °C | 29.9 °C | 84.07 mm |
| June | 20.8 °C | 32.1 °C | 176.53 mm |
| July | 22 °C | 32.8 °C | 175.26 mm |
| August | 22 °C | 32.5 °C | 170.43 mm |
| September | 19.8 °C | 30.6 °C | 138.68 mm |
| October | 14.2 °C | 26.9 °C | 86.61 mm |
| November | 8.5 °C | 22.1 °C | 84.07 mm |
| December | 5.7 °C | 18.4 °C | 103.38 mm |
| Annual | 13.5 °C | 25.9 °C | 1478.26 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |