Fallis, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 48.6 °F (low) to 71.8 °F (high). Annual precipitation averages 36.6 Inches. Fallis 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.2 °F | 49.3 °F | 1.32 in. |
| February | 29.4 °F | 53.3 °F | 1.57 in. |
| March | 38.1 °F | 62.6 °F | 2.7 in. |
| April | 47.1 °F | 71.8 °F | 3.8 in. |
| May | 57.5 °F | 79.3 °F | 5.03 in. |
| June | 66.9 °F | 87.6 °F | 4.81 in. |
| July | 71.1 °F | 93.3 °F | 3.34 in. |
| August | 69.6 °F | 93.0 °F | 3.26 in. |
| September | 61.3 °F | 85.3 °F | 3.49 in. |
| October | 49.1 °F | 73.9 °F | 3.43 in. |
| November | 38.0 °F | 61.7 °F | 2.06 in. |
| December | 28.7 °F | 50.7 °F | 1.76 in. |
| Annual | 48.6 °F | 71.8 °F | 36.57 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| 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 7a : 0°F to 5°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |