| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 41°F | 33°F | 7.3" |
| February | 27°F | 43°F | 34°F | 4.2" |
| March | 34°F | 51°F | 41°F | 6.4" |
| April | 44°F | 63°F | 52°F | 8.0" |
| May | 53°F | 72°F | 62°F | 6.8" |
| June | 62°F | 81°F | 71°F | 9.3" |
| July | 68°F | 86°F | 76°F | 12.7" |
| August | 65°F | 83°F | 74°F | 10.1" |
| September | 60°F | 77°F | 68°F | 7.3" |
| October | 49°F | 66°F | 57°F | 8.3" |
| November | 39°F | 56°F | 47°F | 6.2" |
| December | 32°F | 47°F | 39°F | 8.3" |
| Index | Freehold | New Jersey | National |
| Air quality index | 41 | 45 | 42 |
| Pollution index | 3,756,270 | 7,246,891 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 280 |
| Days with moderate air quality | 83 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.100% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Monmouth Junction, NJ | 8,911 | 41 | 18.0% |
| New Egypt, NJ | 2,187 | 41 | 18.0% |
| Pine Lake Park, NJ | 8,954 | 41 | 18.0% |
| Farmingdale, NJ | 1,307 | 41 | 18.0% |
| West Freehold, NJ | 14,118 | 41 | 18.0% |
| Freehold, NJ | 11,755 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Glen Rock, NJ | 11,747 | 51 | 2.0% |
| Arkansas City, KS | 11,767 | 40 | 20.0% |
| Cantley, QC | 11,767 | n/a | |
| Okmulgee, OK | 11,768 | 5 | 90.0% |
| Hamilton, ON | 11,739 | n/a | |
| Freehold, NJ | 11,755 | 41 | 18.0% |
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