Salmon Brook, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4.6 °C (low) to 15.7 °C (high). Annual precipitation averages 1281.2 Millimeters. Salmon Brook 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 | -7.9 °C | 1.6 °C | 89.92 mm |
| February | -7.2 °C | 3.2 °C | 81.03 mm |
| March | -2.8 °C | 7.8 °C | 106.68 mm |
| April | 3.2 °C | 15.2 °C | 102.11 mm |
| May | 9.1 °C | 21.3 °C | 96.27 mm |
| June | 14.2 °C | 26 °C | 116.08 mm |
| July | 17.2 °C | 28.9 °C | 107.95 mm |
| August | 16.2 °C | 27.9 °C | 108.97 mm |
| September | 12.1 °C | 23.9 °C | 118.87 mm |
| October | 5.7 °C | 17.1 °C | 136.65 mm |
| November | 0.3 °C | 10.5 °C | 97.79 mm |
| December | -4.4 °C | 4.6 °C | 118.87 mm |
| Annual | 4.6 °C | 15.7 °C | 1281.19 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |