Bloomfield, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41 °F (low) to 60.6 °F (high). Annual precipitation averages 52.1 Inches. Bloomfield is located in USDA Plant Hardiness Zone 6b. 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 | 18.6 °F | 35.5 °F | 3.71 in. |
| February | 20.0 °F | 38.3 °F | 3.27 in. |
| March | 27.8 °F | 46.5 °F | 4.34 in. |
| April | 38.4 °F | 59.6 °F | 4.18 in. |
| May | 48.8 °F | 70.6 °F | 3.89 in. |
| June | 58.1 °F | 79.1 °F | 4.74 in. |
| July | 63.4 °F | 84.5 °F | 4.35 in. |
| August | 61.8 °F | 82.7 °F | 4.46 in. |
| September | 54.3 °F | 75.4 °F | 4.82 in. |
| October | 42.8 °F | 63.1 °F | 5.53 in. |
| November | 33.1 °F | 51.4 °F | 4.09 in. |
| December | 24.9 °F | 40.9 °F | 4.67 in. |
| Annual | 41 °F | 60.6 °F | 52.05 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |