Trafalgar, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.3 °C (low) to 17 °C (high). Annual precipitation averages 1169.2 Millimeters. Trafalgar 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 | -6.6 °C | 2.2 °C | 82.3 mm |
| February | -4.9 °C | 4.7 °C | 66.8 mm |
| March | -0.2 °C | 10.6 °C | 90.42 mm |
| April | 5.8 °C | 17.4 °C | 123.95 mm |
| May | 11.8 °C | 23 °C | 130.56 mm |
| June | 16.8 °C | 27.7 °C | 132.84 mm |
| July | 18.4 °C | 29.2 °C | 112.52 mm |
| August | 17.4 °C | 28.8 °C | 83.82 mm |
| September | 13.2 °C | 25.8 °C | 86.11 mm |
| October | 6.8 °C | 18.9 °C | 85.09 mm |
| November | 0.9 °C | 11.2 °C | 89.92 mm |
| December | -3.6 °C | 4.7 °C | 84.84 mm |
| Annual | 6.3 °C | 17 °C | 1169.17 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 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 |