| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 38°F | 28°F | 3.1" |
| February | 19°F | 39°F | 29°F | 2.9" |
| March | 28°F | 48°F | 38°F | 3.8" |
| April | 38°F | 61°F | 49°F | 3.7" |
| May | 47°F | 71°F | 59°F | 3.8" |
| June | 57°F | 78°F | 67°F | 4.7" |
| July | 62°F | 84°F | 73°F | 5.0" |
| August | 60°F | 81°F | 70°F | 4.8" |
| September | 53°F | 76°F | 64°F | 4.2" |
| October | 43°F | 65°F | 53°F | 4.4" |
| November | 32°F | 53°F | 42°F | 3.0" |
| December | 25°F | 43°F | 34°F | 4.8" |
| Index | Mahopac | New York | National |
| Air quality index | 36 | 43 | 42 |
| Pollution index | 16,950,700 | 6,179,275 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 319 |
| Days with moderate air quality | 46 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.030% |
| Benzene | 0.140% |
| Carbon Tetrachloride | 0.070% |
| Lead | 0.080% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Lake Carmel, NY | 8,287 | 36 | 28.0% |
| Putnam Lake, NY | 3,943 | 36 | 28.0% |
| Jefferson Valley-Yorktown, NY | 13,786 | 36 | 28.0% |
| Mount Ivy, NY | 7,390 | 36 | 28.0% |
| Nelsonville, NY | 672 | 36 | 28.0% |
| Mahopac, NY | 8,914 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Rock Falls, IL | 8,914 | 42 | 16.0% |
| Berkeley, MO | 8,912 | 54 | 8.0% |
| Monmouth Junction, NJ | 8,911 | 41 | 18.0% |
| Terrace Heights, WA | 8,917 | 38 | 24.0% |
| Alma, MI | 8,918 | 26 | 48.0% |
| Mahopac, NY | 8,914 | 36 | 28.0% |
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