Alva, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.6 °F (low) to 72 °F (high). Annual precipitation averages 29.8 Inches. Alva is located in USDA Plant Hardiness Zone 7a. 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 | 22.2 °F | 48.2 °F | 0.81 in. |
| February | 25.3 °F | 52.0 °F | 1.11 in. |
| March | 34.5 °F | 62.1 °F | 2.33 in. |
| April | 43.2 °F | 71.2 °F | 2.74 in. |
| May | 54.8 °F | 80.4 °F | 4.36 in. |
| June | 65.2 °F | 90.6 °F | 4.31 in. |
| July | 69.8 °F | 95.7 °F | 3.31 in. |
| August | 68.1 °F | 94.0 °F | 3.68 in. |
| September | 59.8 °F | 86.4 °F | 2.05 in. |
| October | 46.1 °F | 74.2 °F | 2.53 in. |
| November | 33.9 °F | 60.4 °F | 1.33 in. |
| December | 24.2 °F | 48.9 °F | 1.19 in. |
| Annual | 45.6 °F | 72 °F | 29.75 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |