Fort Towson, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.5 °C (low) to 23.6 °C (high). Annual precipitation averages 1274.6 Millimeters. Fort Towson is located in USDA Plant Hardiness Zone 8a. 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 | -0.8 °C | 12.1 °C | 80.77 mm |
| February | 1.5 °C | 14.6 °C | 87.12 mm |
| March | 5.4 °C | 18.8 °C | 112.78 mm |
| April | 9.6 °C | 23.1 °C | 115.82 mm |
| May | 15.1 °C | 27.2 °C | 154.18 mm |
| June | 19.9 °C | 31.7 °C | 106.93 mm |
| July | 21.6 °C | 34.1 °C | 87.63 mm |
| August | 20.8 °C | 34.4 °C | 81.53 mm |
| September | 17.1 °C | 30.8 °C | 105.41 mm |
| October | 10.4 °C | 24.8 °C | 120.4 mm |
| November | 4.7 °C | 18.5 °C | 105.16 mm |
| December | 0.5 °C | 13.2 °C | 116.84 mm |
| Annual | 10.5 °C | 23.6 °C | 1274.57 mm |
| 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 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |