Macomb, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.3 °C (low) to 22.6 °C (high). Annual precipitation averages 997.5 Millimeters. Macomb 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3 °C | 10.3 °C | 38.35 mm |
| February | -0.7 °C | 12.9 °C | 46.99 mm |
| March | 4 °C | 17.8 °C | 73.66 mm |
| April | 8.6 °C | 22.8 °C | 98.04 mm |
| May | 14.2 °C | 26.5 °C | 137.67 mm |
| June | 19 °C | 30.7 °C | 121.67 mm |
| July | 21.3 °C | 33.9 °C | 92.96 mm |
| August | 20.6 °C | 34 °C | 78.23 mm |
| September | 15.8 °C | 29.7 °C | 105.41 mm |
| October | 9.4 °C | 23.8 °C | 90.68 mm |
| November | 3.6 °C | 17.2 °C | 58.17 mm |
| December | -1.2 °C | 11.6 °C | 55.63 mm |
| Annual | 9.3 °C | 22.6 °C | 997.46 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |