Savanna, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.3 °F (low) to 72.8 °F (high). Annual precipitation averages 44.6 Inches. Savanna is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.7 °F | 51.2 °F | 2.55 in. |
| February | 32.3 °F | 55.3 °F | 2.56 in. |
| March | 40.6 °F | 64.0 °F | 3.78 in. |
| April | 48.9 °F | 72.5 °F | 4.58 in. |
| May | 59.0 °F | 79.3 °F | 5.77 in. |
| June | 67.7 °F | 87.6 °F | 4.69 in. |
| July | 71.3 °F | 92.9 °F | 3.64 in. |
| August | 69.9 °F | 93.2 °F | 2.9 in. |
| September | 62.3 °F | 86.1 °F | 3.76 in. |
| October | 50.7 °F | 75.0 °F | 4.1 in. |
| November | 40.2 °F | 63.6 °F | 3.25 in. |
| December | 31.4 °F | 53.3 °F | 3.06 in. |
| Annual | 50.3 °F | 72.8 °F | 44.64 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |