Norwood, Massachusetts has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.7 °C (low) to 15.8 °C (high). Annual precipitation averages 1267.2 Millimeters. Norwood is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.4 °C | 2.7 °C | 103.12 mm |
| February | -6.6 °C | 4.1 °C | 88.14 mm |
| March | -2.4 °C | 8.1 °C | 124.46 mm |
| April | 3.1 °C | 14.6 °C | 113.54 mm |
| May | 8.6 °C | 20.4 °C | 91.19 mm |
| June | 13.8 °C | 25.3 °C | 104.39 mm |
| July | 17.1 °C | 28.4 °C | 91.19 mm |
| August | 16.2 °C | 27.7 °C | 98.55 mm |
| September | 12.1 °C | 23.8 °C | 96.77 mm |
| October | 5.7 °C | 17.2 °C | 125.48 mm |
| November | 0.6 °C | 11.3 °C | 106.43 mm |
| December | -4 °C | 5.7 °C | 123.95 mm |
| Annual | 4.7 °C | 15.8 °C | 1267.21 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6b : -20.6°C to -17.8°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |