| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 41°F | 31°F | 2.8" |
| February | 22°F | 43°F | 31°F | 2.3" |
| March | 30°F | 53°F | 41°F | 3.7" |
| April | 39°F | 66°F | 52°F | 4.0" |
| May | 49°F | 75°F | 62°F | 3.7" |
| June | 58°F | 83°F | 70°F | 5.3" |
| July | 63°F | 87°F | 75°F | 5.3" |
| August | 61°F | 85°F | 72°F | 5.5" |
| September | 55°F | 79°F | 66°F | 3.6" |
| October | 43°F | 68°F | 55°F | 4.5" |
| November | 33°F | 56°F | 44°F | 3.0" |
| December | 27°F | 46°F | 36°F | 4.6" |
| Index | Annandale | New Jersey | National |
| Air quality index | 34 | 45 | 42 |
| Pollution index | 3,167,110 | 7,246,891 | 2,726,193 |
| Measurement | Total |
| Days measured | 349 |
| Days with good air quality | 340 |
| Days with moderate air quality | 9 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.030% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Broadway, NJ | 183 | 34 | 32.0% |
| Harmony, NJ | 410 | 34 | 32.0% |
| Port Colden, NJ | 82 | 34 | 32.0% |
| Chester, NJ | 1,514 | 34 | 32.0% |
| Succasunna, NJ | 9,367 | 34 | 32.0% |
| Annandale, NJ | 1,794 | 34 | 32.0% |
| City | Population | Air Quality Index | National Avg. |
| Keeler Farm, NM | 1,794 | 12 | 76.0% |
| Macedon, NY | 1,794 | 37 | 26.0% |
| Village of the Branch, NY | 1,794 | 43 | 14.0% |
| Ragland, AL | 1,795 | 43 | 14.0% |
| Franklin Furnace, OH | 1,795 | 14 | 72.0% |
| Annandale, NJ | 1,794 | 34 | 32.0% |
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