Mecca, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.1 °F (low) to 63.9 °F (high). Annual precipitation averages 43.5 Inches. Mecca is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.7 °F | 35.9 °F | 2.96 in. |
| February | 22.9 °F | 41.0 °F | 2.54 in. |
| March | 32.1 °F | 52.1 °F | 3.29 in. |
| April | 42.5 °F | 65.3 °F | 4.62 in. |
| May | 53.1 °F | 75.5 °F | 4.61 in. |
| June | 62.1 °F | 83.9 °F | 4.93 in. |
| July | 65.0 °F | 86.5 °F | 4.32 in. |
| August | 62.8 °F | 85.3 °F | 3.24 in. |
| September | 55.0 °F | 79.9 °F | 3.12 in. |
| October | 43.9 °F | 67.8 °F | 3.67 in. |
| November | 33.6 °F | 52.6 °F | 3.41 in. |
| December | 25.0 °F | 40.6 °F | 2.83 in. |
| Annual | 43.1 °F | 63.9 °F | 43.54 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |