| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 37°F | 27°F | 4.4" |
| February | 16°F | 35°F | 26°F | 3.3" |
| March | 23°F | 45°F | 34°F | 5.1" |
| April | 36°F | 61°F | 48°F | 10.7" |
| May | 44°F | 71°F | 58°F | 2.8" |
| June | 57°F | 83°F | 70°F | 4.1" |
| July | 61°F | 85°F | 73°F | 5.5" |
| August | 61°F | 85°F | 72°F | 4.5" |
| September | 53°F | 80°F | 66°F | 1.2" |
| October | 46°F | 67°F | 55°F | 15.1" |
| November | 30°F | 52°F | 41°F | 5.8" |
| December | 20°F | 37°F | 29°F | 4.9" |
| Index | Firthcliffe | New York | National |
| Air quality index | 36 | 43 | 42 |
| Pollution index | 9,612,350 | 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 | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.230% |
| Mercury | 0.080% |
| City | Population | Air Quality Index | National Avg. |
| Hopewell Junction, NY | 725 | 36 | 28.0% |
| Myers Corner, NY | 9,619 | 36 | 28.0% |
| Walden, NY | 6,683 | 36 | 28.0% |
| Jefferson Valley-Yorktown, NY | 13,786 | 36 | 28.0% |
| Mountain Lodge Park, NY | 2,824 | 36 | 28.0% |
| Firthcliffe, NY | 5,051 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Kutztown, PA | 5,051 | 42 | 16.0% |
| Lake City, MN | 5,050 | 37 | 26.0% |
| Orford, QC | 5,049 | n/a | |
| East Quogue, NY | 5,053 | 41 | 18.0% |
| Breckenridge, CO | 5,054 | 47 | 6.0% |
| Firthcliffe, NY | 5,051 | 36 | 28.0% |
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