| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 39°F | 30°F | 3.0" |
| February | 23°F | 40°F | 31°F | 2.6" |
| March | 30°F | 49°F | 39°F | 3.5" |
| April | 41°F | 62°F | 50°F | 4.2" |
| May | 50°F | 71°F | 60°F | 4.2" |
| June | 60°F | 79°F | 69°F | 5.1" |
| July | 66°F | 84°F | 74°F | 4.4" |
| August | 64°F | 82°F | 72°F | 4.2" |
| September | 57°F | 77°F | 66°F | 4.3" |
| October | 47°F | 65°F | 55°F | 5.1" |
| November | 37°F | 54°F | 45°F | 3.1" |
| December | 29°F | 44°F | 36°F | 4.5" |
| Index | New Hempstead | New York | National |
| Air quality index | 51 | 43 | 42 |
| Pollution index | 1,102,120 | 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 | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Walton Park, NY | 3,369 | 36 | 28.0% |
| Mount Ivy, NY | 7,390 | 36 | 28.0% |
| Stony Point, NY | 13,006 | 36 | 28.0% |
| West Haverstraw, NY | 10,220 | 36 | 28.0% |
| Crompond, NY | 2,273 | 36 | 28.0% |
| New Hempstead, NY | 5,426 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Colby, KS | 5,426 | 19 | 62.0% |
| Windsor, QC | 5,425 | n/a | |
| Blaine, WA | 5,427 | 34 | 32.0% |
| Jonesboro, GA | 5,428 | 52 | 4.0% |
| Blauvelt, NY | 5,423 | 51 | 2.0% |
| New Hempstead, NY | 5,426 | 51 | 2.0% |
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