Barkhamsted, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.6 °F (low) to 59.1 °F (high). Annual precipitation averages 51.3 Inches. Barkhamsted is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.3 °F | 34.0 °F | 3.62 in. |
| February | 16.5 °F | 37.1 °F | 3.23 in. |
| March | 24.3 °F | 45.2 °F | 4.16 in. |
| April | 34.7 °F | 58.5 °F | 3.92 in. |
| May | 45.3 °F | 69.5 °F | 4.07 in. |
| June | 54.9 °F | 77.8 °F | 4.83 in. |
| July | 59.9 °F | 82.7 °F | 4.51 in. |
| August | 58.2 °F | 80.8 °F | 4.4 in. |
| September | 50.7 °F | 73.7 °F | 4.84 in. |
| October | 39.5 °F | 61.4 °F | 5.27 in. |
| November | 30.0 °F | 49.8 °F | 3.9 in. |
| December | 21.9 °F | 39.0 °F | 4.5 in. |
| Annual | 37.6 °F | 59.1 °F | 51.25 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |