Gaston, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.7 °F (low) to 61 °F (high). Annual precipitation averages 42.1 Inches. Gaston 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 | 18.4 °F | 33.7 °F | 2.88 in. |
| February | 20.9 °F | 37.7 °F | 2.38 in. |
| March | 29.7 °F | 48.5 °F | 3.29 in. |
| April | 40.0 °F | 61.5 °F | 4.12 in. |
| May | 51.3 °F | 72.3 °F | 4.34 in. |
| June | 60.9 °F | 80.9 °F | 4.73 in. |
| July | 63.5 °F | 83.7 °F | 4.27 in. |
| August | 61.3 °F | 82.3 °F | 3.73 in. |
| September | 53.9 °F | 77.1 °F | 3.32 in. |
| October | 42.9 °F | 64.7 °F | 3.02 in. |
| November | 33.0 °F | 50.5 °F | 3.33 in. |
| December | 24.4 °F | 38.6 °F | 2.73 in. |
| Annual | 41.7 °F | 61 °F | 42.14 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 |