Prosper, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.5 °C (low) to 24.4 °C (high). Annual precipitation averages 1032.8 Millimeters. Prosper is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 0.9 °C | 12.8 °C | 61.98 mm |
| February | 2.9 °C | 15.2 °C | 73.41 mm |
| March | 7.3 °C | 19.3 °C | 93.98 mm |
| April | 11.6 °C | 24 °C | 95.5 mm |
| May | 17 °C | 28.2 °C | 133.35 mm |
| June | 21.8 °C | 32.7 °C | 97.03 mm |
| July | 23.9 °C | 35.2 °C | 56.64 mm |
| August | 23.6 °C | 35.4 °C | 60.2 mm |
| September | 19.4 °C | 31.4 °C | 78.99 mm |
| October | 12.9 °C | 25.6 °C | 120.4 mm |
| November | 6.8 °C | 18.8 °C | 79.5 mm |
| December | 2.2 °C | 13.8 °C | 81.79 mm |
| Annual | 12.5 °C | 24.4 °C | 1032.77 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |