| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 40°F | 34°F | 6.8" |
| February | 27°F | 40°F | 33°F | 6.2" |
| March | 31°F | 44°F | 37°F | 6.4" |
| April | 39°F | 54°F | 46°F | 5.6" |
| May | 49°F | 64°F | 55°F | 7.0" |
| June | 57°F | 73°F | 64°F | 5.8" |
| July | 64°F | 80°F | 71°F | 6.5" |
| August | 62°F | 78°F | 70°F | 7.2" |
| September | 57°F | 72°F | 64°F | 11.6" |
| October | 49°F | 63°F | 56°F | 6.2" |
| November | 39°F | 53°F | 46°F | 5.6" |
| December | 33°F | 45°F | 39°F | 8.6" |
| Index | Provincetown | Massachusetts | National |
| Air quality index | 36 | 40 | 50 |
| Pollution index | 7,903,830 | 12,377,839 | 5,066,862 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 348 |
| Days with moderate air quality | 11 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.060% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.080% |
| Mercury | 0.030% |
| City, State | Population | Air Quality Index | National Avg. |
| North Eastham, MA | 1,742 | 36 | 28% |
| Provincetown, MA | 2,680 | 36 | 28% |
| City, State | Population | Air Quality Index | National Avg. |
| Trenton, IL | 2,680 | 54 | 8% |
| Dennis Port, MA | 2,680 | 36 | 28% |
| Black Canyon City, AZ | 2,681 | 74 | 48% |
| Clinton, NJ | 2,679 | 34 | 32% |
| Bar Nunn, WY | 2,682 | 42 | 16% |
| Provincetown, MA | 2,680 | 36 | 28% |
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