Grabill, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.3 °F (low) to 60.1 °F (high). Annual precipitation averages 37.5 Inches. Grabill 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 | 17.6 °F | 32.4 °F | 2.37 in. |
| February | 19.3 °F | 36.0 °F | 1.99 in. |
| March | 27.7 °F | 47.0 °F | 2.46 in. |
| April | 37.9 °F | 60.4 °F | 3.65 in. |
| May | 49.3 °F | 71.6 °F | 4.45 in. |
| June | 59.2 °F | 80.5 °F | 3.99 in. |
| July | 62.3 °F | 84.4 °F | 3.72 in. |
| August | 60.2 °F | 82.3 °F | 3.83 in. |
| September | 52.8 °F | 76.6 °F | 2.99 in. |
| October | 42.0 °F | 63.8 °F | 2.76 in. |
| November | 31.9 °F | 49.2 °F | 2.91 in. |
| December | 23.2 °F | 37.3 °F | 2.33 in. |
| Annual | 40.3 °F | 60.1 °F | 37.45 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 |