Spencer, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.6 °C (low) to 17.4 °C (high). Annual precipitation averages 1244.4 Millimeters. 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 | -6.8 °C | 2.8 °C | 90.17 mm |
| February | -5.4 °C | 5.3 °C | 71.37 mm |
| March | -0.8 °C | 11.3 °C | 91.19 mm |
| April | 5.1 °C | 17.9 °C | 130.81 mm |
| May | 10.9 °C | 23.2 °C | 135.89 mm |
| June | 15.8 °C | 27.7 °C | 140.72 mm |
| July | 17.9 °C | 29.5 °C | 118.36 mm |
| August | 16.7 °C | 29.1 °C | 84.07 mm |
| September | 12.2 °C | 25.9 °C | 98.3 mm |
| October | 5.8 °C | 19.4 °C | 96.27 mm |
| November | 0.2 °C | 11.8 °C | 100.84 mm |
| December | -4.1 °C | 5.4 °C | 86.36 mm |
| Annual | 5.6 °C | 17.4 °C | 1244.35 mm |
| 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 : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |