Rocky Mountain, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.2 °C (low) to 21.3 °C (high). Annual precipitation averages 1266.4 Millimeters. Rocky Mountain is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -2.6 °C | 9.1 °C | 69.85 mm |
| February | -0.7 °C | 11.4 °C | 62.99 mm |
| March | 3.9 °C | 16.3 °C | 104.39 mm |
| April | 8.4 °C | 21.3 °C | 123.44 mm |
| May | 13.7 °C | 25.1 °C | 155.19 mm |
| June | 18.7 °C | 29.7 °C | 134.62 mm |
| July | 20.8 °C | 32.6 °C | 101.85 mm |
| August | 20.2 °C | 32.6 °C | 94.74 mm |
| September | 15.9 °C | 28.7 °C | 125.22 mm |
| October | 9.6 °C | 22.4 °C | 111.76 mm |
| November | 3.9 °C | 16.1 °C | 101.6 mm |
| December | -0.9 °C | 10.2 °C | 80.77 mm |
| Annual | 9.2 °C | 21.3 °C | 1266.42 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |