Rattan, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.4 °C (low) to 23.7 °C (high). Annual precipitation averages 1252 Millimeters. Rattan 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 | -1.1 °C | 11.9 °C | 78.23 mm |
| February | 1.3 °C | 14.6 °C | 80.52 mm |
| March | 5.2 °C | 18.8 °C | 109.47 mm |
| April | 9.6 °C | 23.3 °C | 114.05 mm |
| May | 15.1 °C | 27.3 °C | 155.7 mm |
| June | 19.8 °C | 31.6 °C | 108.71 mm |
| July | 21.5 °C | 34.3 °C | 85.6 mm |
| August | 20.7 °C | 34.6 °C | 80.26 mm |
| September | 16.9 °C | 31 °C | 106.93 mm |
| October | 10.3 °C | 24.9 °C | 119.38 mm |
| November | 4.6 °C | 18.4 °C | 103.38 mm |
| December | 0.3 °C | 13.1 °C | 109.73 mm |
| Annual | 10.4 °C | 23.7 °C | 1251.96 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 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |