Spencer, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.1 °F (low) to 63.4 °F (high). Annual precipitation averages 49 Inches. Spencer 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 | 19.8 °F | 37.0 °F | 3.55 in. |
| February | 22.3 °F | 41.5 °F | 2.81 in. |
| March | 30.5 °F | 52.3 °F | 3.59 in. |
| April | 41.2 °F | 64.3 °F | 5.15 in. |
| May | 51.6 °F | 73.8 °F | 5.35 in. |
| June | 60.5 °F | 81.8 °F | 5.54 in. |
| July | 64.2 °F | 85.1 °F | 4.66 in. |
| August | 62.1 °F | 84.4 °F | 3.31 in. |
| September | 54.0 °F | 78.6 °F | 3.87 in. |
| October | 42.4 °F | 66.9 °F | 3.79 in. |
| November | 32.3 °F | 53.2 °F | 3.97 in. |
| December | 24.7 °F | 41.7 °F | 3.4 in. |
| Annual | 42.1 °F | 63.4 °F | 48.99 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 |