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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 40°F | 31°F | 2.8" |
| February | 23°F | 41°F | 32°F | 1.9" |
| March | 31°F | 52°F | 40°F | 3.4" |
| April | 41°F | 64°F | 52°F | 3.6" |
| May | 50°F | 74°F | 62°F | 4.3" |
| June | 60°F | 82°F | 70°F | 4.9" |
| July | 65°F | 86°F | 75°F | 5.0" |
| August | 62°F | 84°F | 72°F | 5.8" |
| September | 57°F | 78°F | 66°F | 3.9" |
| October | 46°F | 66°F | 55°F | 4.7" |
| November | 36°F | 55°F | 44°F | 2.9" |
| December | 29°F | 45°F | 36°F | 4.3" |
| Index | New Britain | Pennsylvania | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 8,206,310 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 180 |
| Days with moderate air quality | 169 |
| Days w/ poor A.Q. for sensitive groups | 16 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.260% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.160% |
| Mercury | 1.120% |
| City | Population | Air Quality Index | National Avg. |
| Lambertville, NJ | 3,809 | 41 | 18.0% |
| Croydon, PA | 9,693 | 41 | 18.0% |
| Langhorne, PA | 1,616 | 41 | 18.0% |
| Richboro, PA | 8,480 | 41 | 18.0% |
| Stockton, NJ | 472 | 41 | 18.0% |
| New Britain, PA | 2,957 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Winchester, CA | 2,957 | 89 | 78.0% |
| Citrus City, TX | 2,957 | 42 | 16.0% |
| Greensboro, AL | 2,956 | 35 | 30.0% |
| Valley View, PA | 2,956 | 41 | 18.0% |
| Normandin, QC | 2,956 | n/a | |
| New Britain, PA | 2,957 | 51 | 2.0% |
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