| 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 | Milton | Massachusetts | National |
| Air quality index | 43 | 40 | 42 |
| Pollution index | 24,018,000 | 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 | 0.030% |
| Benzene | 0.220% |
| Carbon Tetrachloride | 0.100% |
| Lead | 0.280% |
| Mercury | 0.130% |
| City | Population | Air Quality Index | National Avg. |
| Belmont, MA | 26,158 | 43 | 14.0% |
| Everett, MA | 46,275 | 43 | 14.0% |
| Medford, MA | 58,290 | 43 | 14.0% |
| Watertown Town, MA | 35,749 | 43 | 14.0% |
| Revere, MA | 53,400 | 43 | 14.0% |
| Milton, MA | 27,590 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| South Laurel, MD | 27,593 | 47 | 6.0% |
| Morrisville, NC | 27,582 | 44 | 12.0% |
| Converse, TX | 27,582 | 49 | 2.0% |
| Tualatin, OR | 27,601 | 38 | 24.0% |
| Lansing, IL | 27,614 | 55 | 10.0% |
| Milton, MA | 27,590 | 43 | 14.0% |
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