Arlington, Massachusetts has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41 °F (low) to 60.1 °F (high). Annual precipitation averages 50.1 Inches. Arlington is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.9 °F | 36.5 °F | 4.01 in. |
| February | 20.5 °F | 39.1 °F | 3.65 in. |
| March | 27.7 °F | 46.0 °F | 4.85 in. |
| April | 38.0 °F | 58.0 °F | 4.33 in. |
| May | 48.0 °F | 68.3 °F | 3.7 in. |
| June | 57.5 °F | 77.4 °F | 4.23 in. |
| July | 63.3 °F | 83.2 °F | 3.79 in. |
| August | 61.9 °F | 81.6 °F | 3.83 in. |
| September | 54.5 °F | 74.6 °F | 3.86 in. |
| October | 43.1 °F | 62.7 °F | 4.87 in. |
| November | 33.7 °F | 52.2 °F | 4.08 in. |
| December | 25.3 °F | 42.1 °F | 4.89 in. |
| Annual | 41 °F | 60.1 °F | 50.09 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |