Topeka, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.5 °C (low) to 15.1 °C (high). Annual precipitation averages 972.3 Millimeters. Topeka 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 | -8.3 °C | -0.3 °C | 61.72 mm |
| February | -7.3 °C | 1.7 °C | 52.58 mm |
| March | -2.6 °C | 8 °C | 57.66 mm |
| April | 3.3 °C | 15.2 °C | 91.69 mm |
| May | 9.8 °C | 21.4 °C | 110.49 mm |
| June | 15.1 °C | 26.5 °C | 105.66 mm |
| July | 16.8 °C | 28.3 °C | 97.28 mm |
| August | 15.7 °C | 27.3 °C | 101.85 mm |
| September | 11.6 °C | 24.1 °C | 79.25 mm |
| October | 5.5 °C | 16.9 °C | 82.04 mm |
| November | -0.1 °C | 9.1 °C | 73.91 mm |
| December | -5 °C | 2.4 °C | 58.17 mm |
| Annual | 4.5 °C | 15.1 °C | 972.3 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 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |