Mier, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.3 °F (low) to 60.6 °F (high). Annual precipitation averages 41.4 Inches. Mier is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.0 °F | 33.1 °F | 2.73 in. |
| February | 20.3 °F | 37.0 °F | 2.25 in. |
| March | 29.2 °F | 48.1 °F | 2.98 in. |
| April | 39.5 °F | 61.0 °F | 4.01 in. |
| May | 50.8 °F | 72.0 °F | 4.45 in. |
| June | 60.5 °F | 80.6 °F | 4.84 in. |
| July | 63.4 °F | 83.5 °F | 4.28 in. |
| August | 61.1 °F | 82.0 °F | 3.74 in. |
| September | 53.7 °F | 76.9 °F | 3.24 in. |
| October | 42.6 °F | 64.3 °F | 3.03 in. |
| November | 32.7 °F | 50.1 °F | 3.22 in. |
| December | 23.9 °F | 38.1 °F | 2.58 in. |
| Annual | 41.3 °F | 60.6 °F | 41.35 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |