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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 43°F | 34°F | 3.4" |
| February | 26°F | 44°F | 34°F | 2.8" |
| March | 33°F | 52°F | 41°F | 3.7" |
| April | 43°F | 63°F | 52°F | 3.7" |
| May | 52°F | 71°F | 61°F | 4.2" |
| June | 62°F | 81°F | 71°F | 4.7" |
| July | 69°F | 86°F | 77°F | 4.2" |
| August | 68°F | 85°F | 76°F | 4.8" |
| September | 61°F | 79°F | 69°F | 3.4" |
| October | 51°F | 68°F | 59°F | 4.8" |
| November | 39°F | 57°F | 48°F | 3.0" |
| December | 32°F | 48°F | 40°F | 4.9" |
| Index | Hempstead | 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. |
| Elwood, NY | 11,582 | 43 | 14.0% |
| Huntington Bay, NY | 1,614 | 43 | 14.0% |
| South Huntington, NY | 10,186 | 43 | 14.0% |
| Cove Neck, NY | 231 | 43 | 14.0% |
| Greenlawn, NY | 14,598 | 43 | 14.0% |
| Hempstead, NY | 55,153 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Chicopee, MA | 55,186 | 40 | 20.0% |
| Apex, NC | 55,220 | 46 | 8.0% |
| Gilroy, CA | 55,227 | 37 | 26.0% |
| Dollard-Des Ormeaux, QC | 55,066 | n/a | |
| Carson City, NV | 55,244 | 41 | 18.0% |
| Hempstead, NY | 55,153 | 51 | 2.0% |
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