Fanshawe, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 49.4 °F (low) to 73.4 °F (high). Annual precipitation averages 52.2 Inches. Fanshawe 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 | 28.0 °F | 51.5 °F | 3.16 in. |
| February | 31.8 °F | 56.0 °F | 2.89 in. |
| March | 39.9 °F | 64.4 °F | 4.44 in. |
| April | 48.2 °F | 72.9 °F | 5.19 in. |
| May | 58.2 °F | 80.0 °F | 5.93 in. |
| June | 66.9 °F | 88.6 °F | 4.75 in. |
| July | 70.6 °F | 93.7 °F | 4.1 in. |
| August | 69.0 °F | 93.6 °F | 4.08 in. |
| September | 61.2 °F | 86.4 °F | 4.67 in. |
| October | 49.3 °F | 75.7 °F | 4.6 in. |
| November | 39.1 °F | 64.0 °F | 4.45 in. |
| December | 30.8 °F | 53.9 °F | 3.92 in. |
| Annual | 49.4 °F | 73.4 °F | 52.18 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |