| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 36°F | 27°F | 4.1" |
| February | 18°F | 36°F | 26°F | 3.0" |
| March | 25°F | 44°F | 35°F | 6.7" |
| April | 37°F | 58°F | 47°F | 10.3" |
| May | 46°F | 67°F | 56°F | 9.4" |
| June | 57°F | 79°F | 67°F | 3.9" |
| July | 62°F | 82°F | 72°F | 5.0" |
| August | 62°F | 84°F | 72°F | 3.4" |
| September | 54°F | 78°F | 66°F | 4.0" |
| October | 46°F | 64°F | 55°F | 10.4" |
| November | 32°F | 51°F | 42°F | 5.0" |
| December | 22°F | 37°F | 29°F | 4.9" |
| Index | Haverhill | 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. |
| Seabrook Beach, NH | 976 | 37 | 26.0% |
| Methuen Town, MA | 50,518 | 37 | 26.0% |
| Salisbury, MA | 5,116 | 37 | 26.0% |
| Derry, NH | 22,891 | 37 | 26.0% |
| Hampton, NH | 10,002 | 37 | 26.0% |
| Haverhill, MA | 63,783 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Port Orange, FL | 63,815 | 37 | 26.0% |
| Fredericton, NB | 63,818 | n/a | |
| Dundalk, MD | 63,826 | 46 | 8.0% |
| Lorain, OH | 63,832 | 50 | = 100 |
| Dublin, CA | 63,856 | 43 | 14.0% |
| Haverhill, MA | 63,783 | 37 | 26.0% |
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