Truro, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 44.9 °F (low) to 58.8 °F (high). Annual precipitation averages 45.5 Inches. Truro is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.8 °F | 38.6 °F | 4.06 in. |
| February | 26.6 °F | 39.8 °F | 3.39 in. |
| March | 31.3 °F | 45.0 °F | 4.67 in. |
| April | 39.9 °F | 54.0 °F | 3.95 in. |
| May | 48.7 °F | 63.9 °F | 3.09 in. |
| June | 58.0 °F | 73.5 °F | 3.31 in. |
| July | 64.9 °F | 80.5 °F | 2.65 in. |
| August | 64.1 °F | 79.3 °F | 3.25 in. |
| September | 58.4 °F | 72.7 °F | 3.93 in. |
| October | 49.0 °F | 62.1 °F | 4.45 in. |
| November | 40.0 °F | 52.4 °F | 4.22 in. |
| December | 31.8 °F | 44.3 °F | 4.52 in. |
| Annual | 44.9 °F | 58.8 °F | 45.49 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |