Murphy, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.1 °C (low) to 21.6 °C (high). Annual precipitation averages 1157.7 Millimeters. Murphy 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 | -3.4 °C | 8.8 °C | 55.63 mm |
| February | -1.4 °C | 11.5 °C | 56.64 mm |
| March | 3.3 °C | 16.6 °C | 93.22 mm |
| April | 8.3 °C | 21.6 °C | 117.6 mm |
| May | 14.1 °C | 25.7 °C | 155.7 mm |
| June | 19.1 °C | 30.3 °C | 122.68 mm |
| July | 21.4 °C | 33.3 °C | 100.33 mm |
| August | 20.6 °C | 33.2 °C | 88.65 mm |
| September | 15.9 °C | 28.9 °C | 108.97 mm |
| October | 9.4 °C | 22.8 °C | 103.12 mm |
| November | 3.3 °C | 16.3 °C | 86.36 mm |
| December | -1.6 °C | 10.3 °C | 68.83 mm |
| Annual | 9.1 °C | 21.6 °C | 1157.73 mm |
| 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 : -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 |