| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 38°F | 29°F | 2.4" |
| February | 20°F | 39°F | 29°F | 2.6" |
| March | 28°F | 47°F | 37°F | 3.3" |
| April | 39°F | 61°F | 49°F | 3.4" |
| May | 49°F | 71°F | 59°F | 3.7" |
| June | 57°F | 78°F | 67°F | 4.9" |
| July | 64°F | 85°F | 74°F | 4.0" |
| August | 62°F | 83°F | 72°F | 3.5" |
| September | 55°F | 76°F | 65°F | 3.6" |
| October | 45°F | 64°F | 54°F | 4.5" |
| November | 35°F | 53°F | 43°F | 2.9" |
| December | 26°F | 42°F | 34°F | 3.7" |
| Index | Lowell | Massachusetts | National |
| Air quality index | 37 | 40 | 42 |
| Pollution index | 24,018,000 | 8,399,610 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 353 |
| Days with moderate air quality | 12 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Pepperell, MA | 2,685 | 37 | 26.0% |
| East Pepperell, MA | 1,916 | 37 | 26.0% |
| Hudson, NH | 7,230 | 37 | 26.0% |
| Haverhill, MA | 63,783 | 37 | 26.0% |
| Groton, MA | 1,127 | 37 | 26.0% |
| Lowell, MA | 111,311 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Centennial, CO | 111,331 | 58 | 16.0% |
| Downey, CA | 111,263 | 72 | 44.0% |
| Pompano Beach, FL | 111,202 | 41 | 18.0% |
| Antioch, CA | 111,468 | 45 | 10.0% |
| Thunder Bay, ON | 111,499 | n/a | |
| Lowell, MA | 111,311 | 37 | 26.0% |
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