Elmer, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.8 °C (low) to 24.2 °C (high). Annual precipitation averages 703.6 Millimeters. Elmer 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 | -2.6 °C | 11.9 °C | 26.67 mm |
| February | -0.6 °C | 14 °C | 29.97 mm |
| March | 4.1 °C | 19.3 °C | 48.51 mm |
| April | 8.4 °C | 24.1 °C | 67.06 mm |
| May | 14.8 °C | 29 °C | 103.12 mm |
| June | 20.2 °C | 33.8 °C | 93.47 mm |
| July | 22.2 °C | 35.9 °C | 61.72 mm |
| August | 21.4 °C | 35.4 °C | 66.55 mm |
| September | 17.2 °C | 31.2 °C | 68.83 mm |
| October | 10.3 °C | 25.2 °C | 66.55 mm |
| November | 3.6 °C | 18.1 °C | 38.1 mm |
| December | -1.5 °C | 12.2 °C | 33.02 mm |
| Annual | 9.8 °C | 24.2 °C | 703.57 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 7b : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |