| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 27°F | 4.8" |
| February | 17°F | 36°F | 26°F | 5.2" |
| March | 25°F | 43°F | 34°F | 8.7" |
| April | 35°F | 55°F | 45°F | 9.9" |
| May | 45°F | 65°F | 54°F | 9.0" |
| June | 55°F | 77°F | 66°F | 3.2" |
| July | 60°F | 81°F | 70°F | 5.0" |
| August | 61°F | 83°F | 71°F | 1.9" |
| September | 53°F | 77°F | 65°F | 4.2" |
| October | 45°F | 64°F | 54°F | 9.9" |
| November | 32°F | 52°F | 42°F | 5.4" |
| December | 22°F | 38°F | 30°F | 6.9" |
| Index | Swampscott | 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. |
| Watertown Town, MA | 35,749 | 43 | 14.0% |
| Andover, MA | 8,821 | 43 | 14.0% |
| Danvers, MA | 27,549 | 43 | 14.0% |
| Revere, MA | 53,400 | 43 | 14.0% |
| Brookline, MA | 59,223 | 43 | 14.0% |
| Swampscott, MA | 15,184 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Rosemère, QC | 15,188 | n/a | |
| Elk Plain, WA | 15,192 | 30 | 40.0% |
| Bellair-Meadowbrook Terrace, FL | 15,168 | 43 | 14.0% |
| Graham, NC | 15,168 | 31 | 38.0% |
| Brooklyn Park, MD | 15,163 | 46 | 8.0% |
| Swampscott, MA | 15,184 | 43 | 14.0% |
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