| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 39°F | 29°F | 3.1" |
| February | 18°F | 40°F | 29°F | 2.8" |
| March | 27°F | 48°F | 37°F | 3.2" |
| April | 37°F | 61°F | 49°F | 3.7" |
| May | 46°F | 71°F | 59°F | 3.4" |
| June | 55°F | 79°F | 67°F | 4.5" |
| July | 61°F | 85°F | 73°F | 3.6" |
| August | 57°F | 83°F | 71°F | 3.6" |
| September | 51°F | 77°F | 64°F | 3.2" |
| October | 41°F | 66°F | 53°F | 4.9" |
| November | 32°F | 55°F | 43°F | 3.6" |
| December | 25°F | 45°F | 34°F | 4.0" |
| Index | Medfield | Massachusetts | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 14,818,200 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 291 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.150% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.130% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Hopedale, MA | 3,643 | 40 | 20.0% |
| Hopkinton, MA | 3,864 | 40 | 20.0% |
| Hudson, MA | 15,222 | 40 | 20.0% |
| Milford, MA | 26,072 | 40 | 20.0% |
| Marlborough, MA | 39,663 | 40 | 20.0% |
| Medfield, MA | 6,668 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Contra Costa Centre, CA | 6,667 | 40 | 20.0% |
| South Bay, FL | 6,665 | 36 | 28.0% |
| Church Hill, TN | 6,664 | 45 | 10.0% |
| Sunnyvale, TX | 6,664 | 51 | 2.0% |
| Marvin, NC | 6,672 | 49 | 2.0% |
| Medfield, MA | 6,668 | 43 | 14.0% |
Here are the best places to live in Massachusetts
Most Dangerous Cities In The US
These are the 10 cheapest cities in Massachusetts
See the best places to live in Medfield