Glencoe, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9 °C (low) to 22 °C (high). Annual precipitation averages 960.9 Millimeters. Glencoe is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.7 °C | 9.4 °C | 34.29 mm |
| February | -2.1 °C | 11.5 °C | 38.86 mm |
| March | 2.8 °C | 16.9 °C | 69.85 mm |
| April | 8.2 °C | 21.9 °C | 101.09 mm |
| May | 14.1 °C | 26.2 °C | 133.1 mm |
| June | 19.3 °C | 31.1 °C | 119.63 mm |
| July | 21.6 °C | 34 °C | 91.69 mm |
| August | 20.8 °C | 33.9 °C | 87.63 mm |
| September | 16.4 °C | 29.7 °C | 97.79 mm |
| October | 9.4 °C | 23.2 °C | 93.22 mm |
| November | 3 °C | 16.5 °C | 51.05 mm |
| December | -2.4 °C | 10.1 °C | 42.67 mm |
| Annual | 9 °C | 22 °C | 960.87 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |