| 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 | Andover | 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. |
| Hudson, NH | 7,386 | 37 | 26.0% |
| Lowell, MA | 114,170 | 37 | 26.0% |
| Methuen Town, MA | 51,590 | 37 | 26.0% |
| Londonderry, NH | 12,432 | 37 | 26.0% |
| Haverhill, MA | 65,500 | 37 | 26.0% |
| Andover, MA | 9,117 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Sheffield, AL | 9,116 | 37 | 26.0% |
| Franklin, KY | 9,114 | 43 | 14.0% |
| New Glasgow, NS | 9,114 | n/a | |
| Covington, TN | 9,113 | 26 | 48.0% |
| Savoy, IL | 9,110 | 42 | 16.0% |
| Andover, MA | 9,117 | 43 | 14.0% |