Russellville, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41 °F (low) to 61.3 °F (high). Annual precipitation averages 43.1 Inches. 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 | 18.1 °F | 34.5 °F | 2.81 in. |
| February | 20.5 °F | 38.9 °F | 2.37 in. |
| March | 29.5 °F | 49.7 °F | 3.1 in. |
| April | 40.0 °F | 61.8 °F | 4.51 in. |
| May | 51.1 °F | 72.5 °F | 4.62 in. |
| June | 60.2 °F | 80.9 °F | 5.11 in. |
| July | 62.8 °F | 83.4 °F | 4.35 in. |
| August | 60.4 °F | 82.3 °F | 3.43 in. |
| September | 52.8 °F | 77.3 °F | 3.27 in. |
| October | 41.8 °F | 65.1 °F | 3.32 in. |
| November | 31.7 °F | 50.7 °F | 3.39 in. |
| December | 23.0 °F | 38.8 °F | 2.83 in. |
| Annual | 41 °F | 61.3 °F | 43.11 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |