Rockingham, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.6 °F (low) to 55.4 °F (high). Annual precipitation averages 45.5 Inches. Rockingham is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Sep. 21 - Sep. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.3 °F | 29.4 °F | 3.25 in. |
| February | 12.2 °F | 32.4 °F | 2.72 in. |
| March | 20.3 °F | 40.5 °F | 3.47 in. |
| April | 31.7 °F | 53.6 °F | 3.59 in. |
| May | 43.4 °F | 66.4 °F | 3.78 in. |
| June | 52.5 °F | 74.7 °F | 4.29 in. |
| July | 57.6 °F | 79.7 °F | 4.18 in. |
| August | 55.4 °F | 78.2 °F | 3.93 in. |
| September | 47.7 °F | 71.2 °F | 3.89 in. |
| October | 36.9 °F | 57.6 °F | 4.85 in. |
| November | 27.5 °F | 45.9 °F | 3.56 in. |
| December | 18.5 °F | 34.8 °F | 3.99 in. |
| Annual | 34.6 °F | 55.4 °F | 45.5 in. |
| Average First Frost Date | Sep. 21 - Sep. 30 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |