| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 28°F | 5.0" |
| February | 21°F | 38°F | 28°F | 4.7" |
| March | 27°F | 46°F | 35°F | 5.5" |
| April | 39°F | 59°F | 48°F | 4.7" |
| May | 48°F | 68°F | 57°F | 4.3" |
| June | 57°F | 77°F | 66°F | 5.2" |
| July | 64°F | 83°F | 72°F | 4.4" |
| August | 62°F | 81°F | 70°F | 4.4" |
| September | 56°F | 74°F | 64°F | 3.7" |
| October | 45°F | 63°F | 53°F | 7.1" |
| November | 35°F | 52°F | 43°F | 4.1" |
| December | 26°F | 41°F | 33°F | 5.9" |
| Index | Newton | Massachusetts | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 7,556,320 | 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 | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.010% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Littleton Common, MA | 3,370 | 40 | 20.0% |
| Maynard, MA | 10,900 | 40 | 20.0% |
| Framingham, MA | 72,846 | 40 | 20.0% |
| Everett, MA | 46,275 | 43 | 14.0% |
| Malden, MA | 60,710 | 43 | 14.0% |
| Newton, MA | 88,322 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Reading, PA | 88,333 | 42 | 16.0% |
| Champaign, IL | 88,288 | 42 | 16.0% |
| Conroe, TX | 88,369 | 52 | 4.0% |
| Palm Coast, FL | 88,222 | 31 | 38.0% |
| O'Fallon, MO | 88,132 | 54 | 8.0% |
| Newton, MA | 88,322 | 43 | 14.0% |
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