Alva, Florida has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 17.2 °C (low) to 29.2 °C (high). Annual precipitation averages 1426.2 Millimeters. Alva is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 10.3 °C | 23.7 °C | 52.58 mm |
| February | 11.7 °C | 25.3 °C | 50.04 mm |
| March | 13.1 °C | 27.1 °C | 61.72 mm |
| April | 15.7 °C | 29.4 °C | 60.2 mm |
| May | 18.7 °C | 31.6 °C | 111 mm |
| June | 21.7 °C | 32.7 °C | 253.75 mm |
| July | 22.6 °C | 33 °C | 227.08 mm |
| August | 22.9 °C | 33.2 °C | 244.09 mm |
| September | 22.4 °C | 32.3 °C | 195.58 mm |
| October | 19.6 °C | 30.2 °C | 76.2 mm |
| November | 14.9 °C | 27 °C | 46.23 mm |
| December | 12.3 °C | 24.8 °C | 47.75 mm |
| Annual | 17.2 °C | 29.2 °C | 1426.22 mm |
| Average First Frost Date | No Frost |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 10a : -1.1°C to 1.7°C |
| Plant Hardiness Zone - 2012 | Zone 9b : -3.9°C to -1.1°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |