Georgetown, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 39.3 °F (low) to 59.4 °F (high). Annual precipitation averages 48.7 Inches. Georgetown 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 | 17.1 °F | 35.4 °F | 3.67 in. |
| February | 18.8 °F | 38.0 °F | 3.6 in. |
| March | 26.1 °F | 45.2 °F | 4.78 in. |
| April | 36.2 °F | 57.5 °F | 4.25 in. |
| May | 46.3 °F | 67.8 °F | 3.75 in. |
| June | 55.8 °F | 76.9 °F | 4.28 in. |
| July | 61.8 °F | 82.8 °F | 3.56 in. |
| August | 60.1 °F | 81.4 °F | 3.43 in. |
| September | 52.6 °F | 74.1 °F | 3.83 in. |
| October | 41.1 °F | 62.0 °F | 4.94 in. |
| November | 32.0 °F | 51.1 °F | 3.9 in. |
| December | 23.5 °F | 40.9 °F | 4.73 in. |
| Annual | 39.3 °F | 59.4 °F | 48.72 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |