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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 41°F | 33°F | 2.7" |
| February | 25°F | 42°F | 33°F | 2.3" |
| March | 32°F | 50°F | 40°F | 3.3" |
| April | 42°F | 60°F | 51°F | 3.7" |
| May | 52°F | 70°F | 60°F | 3.4" |
| June | 61°F | 78°F | 69°F | 4.3" |
| July | 68°F | 84°F | 76°F | 3.2" |
| August | 66°F | 83°F | 74°F | 3.4" |
| September | 60°F | 76°F | 68°F | 3.2" |
| October | 50°F | 66°F | 57°F | 3.5" |
| November | 39°F | 55°F | 47°F | 2.5" |
| December | 32°F | 46°F | 39°F | 4.5" |
| Index | East Northport | New York | National |
| Air quality index | 43 | 43 | 42 |
| Pollution index | 39,208,800 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 262 |
| Days with moderate air quality | 82 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 3 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.320% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.320% |
| Mercury | 0.130% |
| City | Population | Air Quality Index | National Avg. |
| Cos Cob, CT | 7,065 | 43 | 14.0% |
| Riverside, CT | 8,855 | 43 | 14.0% |
| Brentwood, NY | 62,743 | 43 | 14.0% |
| Ronkonkoma, NY | 18,953 | 43 | 14.0% |
| Commack, NY | 36,903 | 43 | 14.0% |
| East Northport, NY | 20,085 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| La Cañada Flintridge, CA | 20,078 | 72 | 44.0% |
| Portsmouth, OH | 20,094 | 14 | 72.0% |
| Pittsburg, KS | 20,096 | 37 | 26.0% |
| Port Angeles, WA | 20,071 | 34 | 32.0% |
| Glassboro, NJ | 20,069 | 40 | 20.0% |
| East Northport, NY | 20,085 | 43 | 14.0% |
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