Matthews, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.5 °F (low) to 60.8 °F (high). Annual precipitation averages 42.1 Inches. Matthews 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 | 18.1 °F | 33.4 °F | 2.84 in. |
| February | 20.5 °F | 37.3 °F | 2.36 in. |
| March | 29.3 °F | 48.2 °F | 3.24 in. |
| April | 39.8 °F | 61.2 °F | 4.1 in. |
| May | 51.0 °F | 72.2 °F | 4.34 in. |
| June | 60.8 °F | 80.9 °F | 4.7 in. |
| July | 63.4 °F | 83.6 °F | 4.27 in. |
| August | 61.1 °F | 82.2 °F | 3.88 in. |
| September | 53.7 °F | 76.9 °F | 3.31 in. |
| October | 42.7 °F | 64.5 °F | 3.03 in. |
| November | 32.8 °F | 50.3 °F | 3.29 in. |
| December | 24.2 °F | 38.3 °F | 2.71 in. |
| Annual | 41.5 °F | 60.8 °F | 42.07 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 |