Bloomington, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.5 °C (low) to 17.7 °C (high). Annual precipitation averages 1249.7 Millimeters. Bloomington is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -5.9 °C | 3.2 °C | 90.68 mm |
| February | -4.4 °C | 5.8 °C | 72.64 mm |
| March | 0.2 °C | 11.6 °C | 92.2 mm |
| April | 6.1 °C | 18.3 °C | 129.79 mm |
| May | 11.8 °C | 23.4 °C | 139.19 mm |
| June | 16.7 °C | 27.9 °C | 138.18 mm |
| July | 18.4 °C | 29.7 °C | 119.38 mm |
| August | 17.4 °C | 29.3 °C | 86.36 mm |
| September | 13.2 °C | 26.1 °C | 95.76 mm |
| October | 6.8 °C | 19.4 °C | 94.49 mm |
| November | 1.3 °C | 12.2 °C | 101.85 mm |
| December | -3.1 °C | 5.6 °C | 89.15 mm |
| Annual | 6.5 °C | 17.7 °C | 1249.67 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°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 |