Westchester, Florida has a Tropical Monsoon climate (Köppen classification: Am). Average annual temperatures range from 69 °F (low) to 84.1 °F (high). Annual precipitation averages 66.1 Inches. Westchester is located in USDA Plant Hardiness Zone 11a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 58.8 °F | 76.2 °F | 2.16 in. |
| February | 61.0 °F | 78.2 °F | 2.22 in. |
| March | 63.6 °F | 80.3 °F | 2.62 in. |
| April | 67.6 °F | 83.7 °F | 3.23 in. |
| May | 71.7 °F | 86.6 °F | 6.04 in. |
| June | 75.0 °F | 89.1 °F | 9.86 in. |
| July | 76.2 °F | 90.4 °F | 7.8 in. |
| August | 76.5 °F | 90.6 °F | 9.02 in. |
| September | 75.8 °F | 89.1 °F | 9.62 in. |
| October | 72.6 °F | 86.1 °F | 7.87 in. |
| November | 66.5 °F | 81.2 °F | 3.08 in. |
| December | 62.2 °F | 78.1 °F | 2.59 in. |
| Annual | 69 °F | 84.1 °F | 66.11 in. |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 11a : 40°F to 35°F |
| Plant Hardiness Zone - 2012 | Zone 10b : 35°F to 30°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Am - Tropical Monsoon |