Fish Lake, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.7 °C (low) to 15.2 °C (high). Annual precipitation averages 1021.4 Millimeters. Fish Lake is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.2 °C | 0.1 °C | 66.8 mm |
| February | -6.8 °C | 2.1 °C | 57.15 mm |
| March | -2.2 °C | 8.2 °C | 59.44 mm |
| April | 3.5 °C | 15.2 °C | 88.9 mm |
| May | 9.7 °C | 21.4 °C | 106.93 mm |
| June | 14.9 °C | 26.4 °C | 110.24 mm |
| July | 16.8 °C | 28.3 °C | 107.7 mm |
| August | 15.9 °C | 27.3 °C | 105.92 mm |
| September | 11.7 °C | 24.3 °C | 86.36 mm |
| October | 5.7 °C | 17.3 °C | 93.98 mm |
| November | 0.2 °C | 9.3 °C | 74.68 mm |
| December | -4.8 °C | 2.9 °C | 63.25 mm |
| Annual | 4.7 °C | 15.2 °C | 1021.35 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 |