Stafford Springs, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.9 °F (low) to 58.7 °F (high). Annual precipitation averages 48.7 Inches. Stafford Springs is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.1 °F | 34.6 °F | 3.3 in. |
| February | 16.8 °F | 37.0 °F | 2.99 in. |
| March | 24.8 °F | 44.7 °F | 4.05 in. |
| April | 35.0 °F | 57.4 °F | 4.06 in. |
| May | 45.2 °F | 68.1 °F | 3.58 in. |
| June | 54.6 °F | 76.4 °F | 4.54 in. |
| July | 60.4 °F | 81.5 °F | 3.98 in. |
| August | 58.5 °F | 79.8 °F | 4.47 in. |
| September | 51.3 °F | 73.1 °F | 4.6 in. |
| October | 39.8 °F | 61.2 °F | 5.06 in. |
| November | 30.3 °F | 50.0 °F | 3.66 in. |
| December | 22.5 °F | 40.1 °F | 4.4 in. |
| Annual | 37.9 °F | 58.7 °F | 48.69 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |