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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 5°F | 28°F | 17°F | 1.7" |
| February | 6°F | 30°F | 18°F | 1.8" |
| March | 15°F | 40°F | 27°F | 2.0" |
| April | 28°F | 55°F | 41°F | 3.0" |
| May | 39°F | 68°F | 54°F | 3.9" |
| June | 48°F | 75°F | 61°F | 5.0" |
| July | 53°F | 80°F | 66°F | 4.5" |
| August | 51°F | 78°F | 64°F | 5.0" |
| September | 44°F | 72°F | 57°F | 3.0" |
| October | 35°F | 59°F | 46°F | 3.7" |
| November | 24°F | 46°F | 34°F | 2.2" |
| December | 13°F | 33°F | 23°F | 3.1" |
| Index | Berlin | New Hampshire | National |
| Air quality index | 40 | 34 | 42 |
| Pollution index | 2,398,170 | 3,959,618 | 2,726,193 |
| Measurement | Total |
| Days measured | 324 |
| Days with good air quality | 314 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Gorham, NH | 1,948 | 40 | 20.0% |
| Berlin, NH | 10,025 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Rodeo, CA | 10,023 | 40 | 20.0% |
| Holmen, WI | 10,023 | 35 | 30.0% |
| Westgate, FL | 10,027 | 36 | 28.0% |
| Paris, TN | 10,021 | 27 | 46.0% |
| Yarmouth, NS | 10,021 | n/a | |
| Berlin, NH | 10,025 | 40 | 20.0% |
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