| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 40°F | 32°F | 5.1" |
| February | 29°F | 45°F | 36°F | 4.2" |
| March | 37°F | 54°F | 45°F | 2.6" |
| April | 47°F | 66°F | 55°F | 4.4" |
| May | 55°F | 74°F | 64°F | 5.7" |
| June | 65°F | 83°F | 73°F | 4.8" |
| July | 70°F | 88°F | 79°F | 3.8" |
| August | 69°F | 87°F | 77°F | 3.3" |
| September | 63°F | 80°F | 71°F | 5.3" |
| October | 48°F | 66°F | 57°F | 4.4" |
| November | 42°F | 57°F | 49°F | 5.3" |
| December | 35°F | 48°F | 41°F | 5.2" |
| Index | Belford | New Jersey | National |
| Air quality index | 51 | 45 | 42 |
| Pollution index | 9,503,730 | 7,246,891 | 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 | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Old Bridge, NJ | 27,836 | 41 | 18.0% |
| Freehold, NJ | 11,755 | 41 | 18.0% |
| Englishtown, NJ | 1,999 | 41 | 18.0% |
| Yorketown, NJ | 6,739 | 41 | 18.0% |
| Robertsville, NJ | 11,866 | 41 | 18.0% |
| Belford, NJ | 2,049 | 51 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Lexington, IL | 2,049 | 44 | 12.0% |
| Okanagan-Similkameen E, BC | 2,049 | n/a | |
| Edgewood, IN | 2,050 | 42 | 16.0% |
| Ramseur, NC | 2,048 | 31 | 38.0% |
| Groton, NY | 2,048 | 34 | 32.0% |
| Belford, NJ | 2,049 | 51 | 2.0% |
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