| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 40°F | 31°F | 5.0" |
| February | 21°F | 38°F | 29°F | 3.2" |
| March | 27°F | 49°F | 37°F | 8.8" |
| April | 39°F | 62°F | 50°F | 10.1" |
| May | 49°F | 73°F | 61°F | 2.7" |
| June | 61°F | 83°F | 72°F | 6.6" |
| July | 65°F | 85°F | 75°F | 8.4" |
| August | 65°F | 86°F | 75°F | 7.9" |
| September | 56°F | 81°F | 68°F | 2.2" |
| October | 49°F | 68°F | 58°F | 15.6" |
| November | 34°F | 55°F | 44°F | 6.5" |
| December | 26°F | 40°F | 33°F | 8.0" |
| Index | Hillburn | 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. |
| Highland Lakes, NJ | 4,666 | 34 | 32.0% |
| Greenwood Lake, NY | 3,080 | 36 | 28.0% |
| Stony Point, NY | 13,006 | 36 | 28.0% |
| Warwick, NY | 6,769 | 36 | 28.0% |
| Harriman, NY | 2,996 | 36 | 28.0% |
| Hillburn, NY | 1,031 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Plymouth, CA | 1,031 | 52 | 4.0% |
| South Woodstock, CT | 1,031 | 33 | 34.0% |
| Shipshewana, IN | 1,031 | 37 | 26.0% |
| Bude, MS | 1,031 | 44 | 12.0% |
| Harlowton, MT | 1,031 | 21 | 58.0% |
| Hillburn, NY | 1,031 | 51 | 2.0% |
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