| 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 | Merrick | New York | National |
| Air quality index | 51 | 43 | 42 |
| Pollution index | 20,796,900 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 169 |
| Days with moderate air quality | 180 |
| Days w/ poor A.Q. for sensitive groups | 16 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.130% |
| Carbon Tetrachloride | 0.130% |
| Lead | 0.070% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Commack, NY | 36,903 | 43 | 14.0% |
| South Huntington, NY | 10,186 | 43 | 14.0% |
| Deer Park, NY | 26,043 | 43 | 14.0% |
| West Bay Shore, NY | 4,506 | 43 | 14.0% |
| Laurel Hollow, NY | 1,967 | 43 | 14.0% |
| Merrick, NY | 20,594 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Gardner, MA | 20,605 | 40 | 20.0% |
| Clemmons, NC | 20,574 | 45 | 10.0% |
| Fernley, NV | 20,616 | 39 | 22.0% |
| Bryant, AR | 20,563 | 45 | 10.0% |
| Prunedale, CA | 20,560 | 37 | 26.0% |
| Merrick, NY | 20,594 | 51 | 2.0% |
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