Jasper, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 44.6 °F (low) to 66 °F (high). Annual precipitation averages 49.8 Inches. Jasper is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 22.8 °F | 40.4 °F | 3.6 in. |
| February | 25.4 °F | 45.0 °F | 3.15 in. |
| March | 33.6 °F | 55.2 °F | 4.56 in. |
| April | 43.5 °F | 66.9 °F | 5.28 in. |
| May | 54.1 °F | 76.1 °F | 5.48 in. |
| June | 62.6 °F | 83.8 °F | 4.79 in. |
| July | 65.8 °F | 87.3 °F | 4.51 in. |
| August | 63.8 °F | 86.5 °F | 3.13 in. |
| September | 56.2 °F | 81.1 °F | 3.87 in. |
| October | 44.8 °F | 69.5 °F | 3.47 in. |
| November | 34.7 °F | 55.6 °F | 4.1 in. |
| December | 27.5 °F | 44.9 °F | 3.87 in. |
| Annual | 44.6 °F | 66 °F | 49.81 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°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 |