Alvin, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.2 °C (low) to 26.1 °C (high). Annual precipitation averages 1387.9 Millimeters. Alvin is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7 °C | 17.3 °C | 116.59 mm |
| February | 9.2 °C | 19.2 °C | 83.06 mm |
| March | 12.4 °C | 22.4 °C | 81.28 mm |
| April | 15.9 °C | 25.7 °C | 101.85 mm |
| May | 20.2 °C | 29.2 °C | 124.71 mm |
| June | 23.3 °C | 32.2 °C | 140.97 mm |
| July | 24.1 °C | 33.2 °C | 112.52 mm |
| August | 24.1 °C | 33.7 °C | 144.02 mm |
| September | 21.9 °C | 31.4 °C | 149.35 mm |
| October | 16.7 °C | 27.7 °C | 116.84 mm |
| November | 11.5 °C | 22.4 °C | 109.98 mm |
| December | 8.1 °C | 18.4 °C | 106.68 mm |
| Annual | 16.2 °C | 26.1 °C | 1387.85 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |