Richmond, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.5 °F (low) to 61.5 °F (high). Annual precipitation averages 42.6 Inches. Richmond 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 | 19.1 °F | 35.1 °F | 3.14 in. |
| February | 21.6 °F | 39.1 °F | 2.33 in. |
| March | 29.8 °F | 49.5 °F | 3.43 in. |
| April | 40.0 °F | 62.5 °F | 4.35 in. |
| May | 51.0 °F | 72.3 °F | 4.71 in. |
| June | 60.1 °F | 80.7 °F | 4.76 in. |
| July | 62.8 °F | 83.5 °F | 4.08 in. |
| August | 60.7 °F | 82.5 °F | 3.05 in. |
| September | 53.3 °F | 76.9 °F | 3.06 in. |
| October | 42.2 °F | 64.9 °F | 3.11 in. |
| November | 32.5 °F | 51.4 °F | 3.3 in. |
| December | 24.6 °F | 39.5 °F | 3.23 in. |
| Annual | 41.5 °F | 61.5 °F | 42.55 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 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 |