Calera, Oklahoma has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52 °F (low) to 74.2 °F (high). Annual precipitation averages 43.9 Inches. Calera is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 31.3 °F | 52.9 °F | 2.43 in. |
| February | 34.9 °F | 57.1 °F | 2.58 in. |
| March | 42.6 °F | 65.2 °F | 3.8 in. |
| April | 50.3 °F | 73.2 °F | 3.94 in. |
| May | 60.3 °F | 80.6 °F | 5.81 in. |
| June | 68.7 °F | 89.0 °F | 4.48 in. |
| July | 72.6 °F | 94.1 °F | 3.16 in. |
| August | 71.5 °F | 94.5 °F | 2.82 in. |
| September | 64.1 °F | 87.2 °F | 3.85 in. |
| October | 52.2 °F | 76.5 °F | 4.29 in. |
| November | 42.2 °F | 64.8 °F | 3.46 in. |
| December | 33.5 °F | 54.8 °F | 3.3 in. |
| Annual | 52 °F | 74.2 °F | 43.92 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |