| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 46°F | 36°F | 2.6" |
| February | 29°F | 49°F | 38°F | 2.2" |
| March | 37°F | 58°F | 46°F | 3.4" |
| April | 47°F | 70°F | 57°F | 3.8" |
| May | 57°F | 76°F | 66°F | 4.4" |
| June | 66°F | 85°F | 75°F | 4.8" |
| July | 71°F | 89°F | 79°F | 3.5" |
| August | 69°F | 87°F | 77°F | 3.1" |
| September | 62°F | 81°F | 71°F | 4.2" |
| October | 50°F | 70°F | 59°F | 4.3" |
| November | 39°F | 59°F | 48°F | 2.8" |
| December | 32°F | 50°F | 40°F | 3.4" |
| Index | Boswell's Corner | Virginia | National |
| Air quality index | 47 | 58 | 42 |
| Pollution index | 658,482 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 209 |
| Days with moderate air quality | 145 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.004% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Independent Hill, VA | 9,514 | 47 | 6.0% |
| Fairview Beach, VA | 461 | 47 | 6.0% |
| Aquia Harbour, VA | 5,709 | 47 | 6.0% |
| Dumfries, VA | 5,559 | 47 | 6.0% |
| Mason Neck, VA | 1,938 | 47 | 6.0% |
| Boswell's Corner, VA | 1,442 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Dale, IN | 1,442 | 6 | 88.0% |
| Caledonia, MI | 1,442 | 38 | 24.0% |
| Oolitic, IN | 1,443 | 42 | 16.0% |
| Dassel, MN | 1,443 | 32 | 36.0% |
| Richton, MS | 1,441 | 35 | 30.0% |
| Boswell's Corner, VA | 1,442 | 47 | 6.0% |
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