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| 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 | Randolph | 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. |
| Braintree Town, MA | 37,196 | 43 | 14.0% |
| Hingham, MA | 5,837 | 43 | 14.0% |
| Milton, MA | 27,590 | 43 | 14.0% |
| Norwood, MA | 29,446 | 43 | 14.0% |
| Walpole, MA | 6,211 | 43 | 14.0% |
| Randolph, MA | 33,526 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Dalton, GA | 33,515 | 43 | 14.0% |
| Kaneohe, HI | 33,540 | 30 | 40.0% |
| Long Beach, NY | 33,475 | 51 | 2.0% |
| Lake Stevens, WA | 33,470 | 45 | 10.0% |
| Saint-Georges, QC | 33,468 | n/a | |
| Randolph, MA | 33,526 | 43 | 14.0% |
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