Rockingham, Vermont has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.4 °C (low) to 13 °C (high). Annual precipitation averages 1155.7 Millimeters. 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 | -11.5 °C | -1.4 °C | 82.55 mm |
| February | -11 °C | 0.2 °C | 69.09 mm |
| March | -6.5 °C | 4.7 °C | 88.14 mm |
| April | -0.2 °C | 12 °C | 91.19 mm |
| May | 6.3 °C | 19.1 °C | 96.01 mm |
| June | 11.4 °C | 23.7 °C | 108.97 mm |
| July | 14.2 °C | 26.5 °C | 106.17 mm |
| August | 13 °C | 25.7 °C | 99.82 mm |
| September | 8.7 °C | 21.8 °C | 98.81 mm |
| October | 2.7 °C | 14.2 °C | 123.19 mm |
| November | -2.5 °C | 7.7 °C | 90.42 mm |
| December | -7.5 °C | 1.6 °C | 101.35 mm |
| Annual | 1.4 °C | 13 °C | 1155.71 mm |
| 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 : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |