| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 38°F | 28°F | 5.8" |
| February | 20°F | 37°F | 27°F | 6.3" |
| March | 25°F | 45°F | 34°F | 13.2" |
| April | 38°F | 60°F | 47°F | 9.9" |
| May | 46°F | 68°F | 56°F | 3.9" |
| June | 57°F | 80°F | 67°F | 5.1" |
| July | 62°F | 82°F | 71°F | 7.1" |
| August | 62°F | 84°F | 71°F | 8.8" |
| September | 55°F | 77°F | 65°F | 9.0" |
| October | 47°F | 64°F | 55°F | 4.0" |
| November | 34°F | 53°F | 42°F | 5.2" |
| December | 22°F | 39°F | 30°F | 7.2" |
| Index | Bellingham | Massachusetts | National |
| Air quality index | 44 | 40 | 42 |
| Pollution index | 14,818,200 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 289 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| 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. |
| Milford, MA | 26,072 | 40 | 20.0% |
| Cordaville, MA | 2,884 | 40 | 20.0% |
| East Douglas, MA | 2,985 | 40 | 20.0% |
| Upton, MA | 2,279 | 40 | 20.0% |
| Framingham, MA | 72,846 | 40 | 20.0% |
| Bellingham, MA | 4,216 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Hometown, IL | 4,216 | 55 | 10.0% |
| Pittsfield, IL | 4,215 | 41 | 18.0% |
| Huber Ridge, OH | 4,213 | 46 | 8.0% |
| Sebring, OH | 4,213 | 46 | 8.0% |
| Williamston, SC | 4,219 | 31 | 38.0% |
| Bellingham, MA | 4,216 | 44 | 12.0% |
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