| 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 | Ipswich | Massachusetts | National |
| Air quality index | 47 | 40 | 50 |
| Pollution index | 24,018,000 | 12,377,839 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 223 |
| Days with moderate air quality | 137 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.220% |
| Carbon Tetrachloride | 0.100% |
| Lead | 0.280% |
| Mercury | 0.130% |
| City, State | Population | Air Quality Index | National Avg. |
| Seabrook Beach, NH | 958 | 36 | 28% |
| Haverhill, MA | 62,340 | 36 | 28% |
| Newburyport, MA | 17,837 | 36 | 28% |
| Amesbury Town, MA | 17,082 | 36 | 28% |
| Salisbury, MA | 4,992 | 36 | 28% |
| Ipswich, MA | 4,215 | 47 | 6% |
| City, State | Population | Air Quality Index | National Avg. |
| Herricks, NY | 4,215 | 53 | 6% |
| Dillon, MT | 4,214 | 29 | 42% |
| West Milwaukee, WI | 4,214 | 45 | 10% |
| Euharlee, GA | 4,214 | 52 | 4% |
| Stock Island, FL | 4,214 | 33 | 34% |
| Ipswich, MA | 4,215 | 47 | 6% |