| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 38°F | 29°F | 3.1" |
| February | 20°F | 39°F | 29°F | 2.8" |
| March | 27°F | 46°F | 36°F | 3.9" |
| April | 38°F | 59°F | 48°F | 3.9" |
| May | 47°F | 68°F | 57°F | 3.9" |
| June | 56°F | 76°F | 66°F | 4.9" |
| July | 62°F | 83°F | 72°F | 3.8" |
| August | 60°F | 81°F | 70°F | 4.2" |
| September | 54°F | 75°F | 64°F | 3.2" |
| October | 43°F | 64°F | 53°F | 5.3" |
| November | 34°F | 53°F | 43°F | 3.5" |
| December | 26°F | 43°F | 34°F | 4.4" |
| Index | Reading | 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. |
| Methuen Town, MA | 50,518 | 37 | 26.0% |
| Lawrence, MA | 80,022 | 37 | 26.0% |
| Lowell, MA | 111,311 | 37 | 26.0% |
| Rowley, MA | 1,803 | 43 | 14.0% |
| Belmont, MA | 26,158 | 43 | 14.0% |
| Reading, MA | 25,236 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Collingwood, ON | 25,244 | n/a | |
| Zanesville, OH | 25,246 | 41 | 18.0% |
| Watertown, NY | 25,224 | 35 | 30.0% |
| Hazelwood, MO | 25,222 | 54 | 8.0% |
| Lunenburg, NS | 25,205 | n/a | |
| Reading, MA | 25,236 | 43 | 14.0% |
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