Russellville, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5 °C (low) to 16.3 °C (high). Annual precipitation averages 1095 Millimeters. Russellville is located in USDA Plant Hardiness Zone 5b. 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 | -7.7 °C | 1.4 °C | 71.37 mm |
| February | -6.4 °C | 3.8 °C | 60.2 mm |
| March | -1.4 °C | 9.8 °C | 78.74 mm |
| April | 4.4 °C | 16.6 °C | 114.55 mm |
| May | 10.6 °C | 22.5 °C | 117.35 mm |
| June | 15.7 °C | 27.2 °C | 129.79 mm |
| July | 17.1 °C | 28.6 °C | 110.49 mm |
| August | 15.8 °C | 27.9 °C | 87.12 mm |
| September | 11.6 °C | 25.2 °C | 83.06 mm |
| October | 5.4 °C | 18.4 °C | 84.33 mm |
| November | -0.2 °C | 10.4 °C | 86.11 mm |
| December | -5 °C | 3.8 °C | 71.88 mm |
| Annual | 5 °C | 16.3 °C | 1094.99 mm |
| 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 5b : -26.1°C to -23.3°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 |