Stamford, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.3 °C (low) to 16.3 °C (high). Annual precipitation averages 1269.7 Millimeters. Stamford is located in USDA Plant Hardiness Zone 7a. 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 | -4.3 °C | 3.8 °C | 101.85 mm |
| February | -4.1 °C | 4.8 °C | 75.69 mm |
| March | -0.2 °C | 8.4 °C | 107.19 mm |
| April | 5.2 °C | 15.1 °C | 103.12 mm |
| May | 10.6 °C | 20.5 °C | 97.03 mm |
| June | 16 °C | 25.6 °C | 118.62 mm |
| July | 19.2 °C | 28.8 °C | 97.54 mm |
| August | 18.8 °C | 27.6 °C | 115.82 mm |
| September | 14.7 °C | 24.4 °C | 121.16 mm |
| October | 9.1 °C | 18 °C | 114.05 mm |
| November | 3.6 °C | 12.1 °C | 101.85 mm |
| December | -0.8 °C | 6.7 °C | 115.82 mm |
| Annual | 7.3 °C | 16.3 °C | 1269.74 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 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |