Bloomington, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 43.8 °F (low) to 63.9 °F (high). Annual precipitation averages 49.2 Inches. 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 | 21.4 °F | 37.7 °F | 3.57 in. |
| February | 24.0 °F | 42.5 °F | 2.86 in. |
| March | 32.4 °F | 52.8 °F | 3.63 in. |
| April | 43.0 °F | 65.0 °F | 5.11 in. |
| May | 53.3 °F | 74.1 °F | 5.48 in. |
| June | 62.0 °F | 82.3 °F | 5.44 in. |
| July | 65.1 °F | 85.5 °F | 4.7 in. |
| August | 63.3 °F | 84.8 °F | 3.4 in. |
| September | 55.8 °F | 79.0 °F | 3.77 in. |
| October | 44.3 °F | 66.9 °F | 3.72 in. |
| November | 34.3 °F | 53.9 °F | 4.01 in. |
| December | 26.4 °F | 42.0 °F | 3.51 in. |
| Annual | 43.8 °F | 63.9 °F | 49.2 in. |
| 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 : -5°F to 0°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 |