Hagerstown, Indiana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41 °F (low) to 61 °F (high). Annual precipitation averages 44.6 Inches. Hagerstown 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 | 18.2 °F | 34.4 °F | 3.19 in. |
| February | 20.8 °F | 38.4 °F | 2.47 in. |
| March | 29.1 °F | 49.0 °F | 3.71 in. |
| April | 39.6 °F | 61.8 °F | 4.64 in. |
| May | 50.7 °F | 71.8 °F | 4.91 in. |
| June | 59.8 °F | 80.2 °F | 4.93 in. |
| July | 62.3 °F | 83.0 °F | 4.43 in. |
| August | 60.4 °F | 82.0 °F | 3.33 in. |
| September | 52.9 °F | 76.7 °F | 3.22 in. |
| October | 41.9 °F | 64.8 °F | 3.14 in. |
| November | 31.9 °F | 50.9 °F | 3.48 in. |
| December | 23.9 °F | 39.0 °F | 3.16 in. |
| Annual | 41 °F | 61 °F | 44.61 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 | Dfb - Humid Continental Mild Summer, Wet All Year |