| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 40°F | 32°F | 3.8" |
| February | 24°F | 41°F | 32°F | 3.4" |
| March | 30°F | 46°F | 38°F | 3.7" |
| April | 39°F | 56°F | 47°F | 4.1" |
| May | 49°F | 66°F | 57°F | 3.7" |
| June | 57°F | 74°F | 65°F | 4.0" |
| July | 65°F | 81°F | 73°F | 3.6" |
| August | 63°F | 79°F | 71°F | 3.7" |
| September | 56°F | 73°F | 65°F | 4.5" |
| October | 47°F | 64°F | 56°F | 5.1" |
| November | 37°F | 54°F | 46°F | 4.3" |
| December | 30°F | 46°F | 38°F | 4.6" |
| Index | Barnstable Town | Massachusetts | National |
| Air quality index | 36 | 40 | 42 |
| Pollution index | 7,903,830 | 8,399,610 | 2,726,193 |
| 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 | Population | Air Quality Index | National Avg. |
| Monomoscoy Island, MA | 114 | 36 | 28.0% |
| Seabrook, MA | 520 | 36 | 28.0% |
| Dennis, MA | 1,962 | 36 | 28.0% |
| East Sandwich, MA | 3,628 | 36 | 28.0% |
| Northwest Harwich, MA | 4,123 | 36 | 28.0% |
| Barnstable Town, MA | 44,497 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Whitney, NV | 44,488 | 54 | 8.0% |
| Saint-Eustache, QC | 44,539 | n/a | |
| Blacksburg, VA | 44,395 | 41 | 18.0% |
| San Bruno, CA | 44,663 | 43 | 14.0% |
| Strongsville, OH | 44,675 | 50 | = 100 |
| Barnstable Town, MA | 44,497 | 36 | 28.0% |
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