Glen Allen, Virginia has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.5 °F (low) to 68.8 °F (high). Annual precipitation averages 46 Inches. Glen Allen is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.9 °F | 47.6 °F | 3.48 in. |
| February | 28.1 °F | 51.0 °F | 2.8 in. |
| March | 34.9 °F | 59.1 °F | 3.86 in. |
| April | 44.8 °F | 70.1 °F | 3.22 in. |
| May | 54.5 °F | 76.8 °F | 4.21 in. |
| June | 63.1 °F | 84.3 °F | 4.26 in. |
| July | 67.4 °F | 88.4 °F | 4.28 in. |
| August | 65.9 °F | 86.6 °F | 4.64 in. |
| September | 59.4 °F | 80.7 °F | 4.33 in. |
| October | 47.2 °F | 70.3 °F | 3.84 in. |
| November | 36.2 °F | 60.1 °F | 3.26 in. |
| December | 29.8 °F | 51.0 °F | 3.83 in. |
| Annual | 46.5 °F | 68.8 °F | 46.01 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |