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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 37°F | 27°F | 2.8" |
| February | 18°F | 39°F | 28°F | 3.3" |
| March | 26°F | 47°F | 36°F | 4.0" |
| April | 38°F | 62°F | 49°F | 3.9" |
| May | 48°F | 72°F | 59°F | 4.0" |
| June | 57°F | 80°F | 68°F | 5.0" |
| July | 63°F | 86°F | 74°F | 4.0" |
| August | 61°F | 83°F | 72°F | 3.6" |
| September | 54°F | 77°F | 65°F | 3.7" |
| October | 43°F | 65°F | 53°F | 5.8" |
| November | 32°F | 53°F | 42°F | 3.2" |
| December | 23°F | 42°F | 32°F | 4.0" |
| Index | Clinton | Massachusetts | National |
| Air quality index | 40 | 40 | 42 |
| Pollution index | 7,556,320 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 312 |
| Days with moderate air quality | 52 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.010% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Groton, MA | 1,127 | 37 | 26.0% |
| Framingham, MA | 72,846 | 40 | 20.0% |
| Ayer, MA | 2,551 | 40 | 20.0% |
| Littleton Common, MA | 3,370 | 40 | 20.0% |
| Fitchburg, MA | 40,576 | 40 | 20.0% |
| Clinton, MA | 7,058 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Bremen, GA | 7,057 | 44 | 12.0% |
| Russellville, KY | 7,056 | 43 | 14.0% |
| Atherton, CA | 7,060 | 43 | 14.0% |
| Grove, OK | 7,060 | 38 | 24.0% |
| Morrow, GA | 7,061 | 52 | 4.0% |
| Clinton, MA | 7,058 | 40 | 20.0% |
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