| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 43°F | 34°F | 1.3" |
| February | 30°F | 47°F | 37°F | 0.4" |
| March | 37°F | 57°F | 46°F | 1.8" |
| April | 47°F | 69°F | 57°F | 0.8" |
| May | 56°F | 76°F | 65°F | 2.5" |
| June | 64°F | 84°F | 73°F | 0.1" |
| July | 68°F | 89°F | 77°F | 5.9" |
| August | 66°F | 86°F | 75°F | 2.6" |
| September | 60°F | 80°F | 69°F | 4.2" |
| October | 49°F | 69°F | 57°F | 2.4" |
| November | 38°F | 57°F | 46°F | 0.9" |
| December | 33°F | 48°F | 40°F | 0.6" |
| Index | Bryantown | Maryland | National |
| Air quality index | 47 | 43 | 42 |
| Pollution index | 384,133 | 5,342,367 | 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 | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Prince Frederick, MD | 2,709 | 41 | 18.0% |
| Charlotte Hall, MD | 1,740 | 47 | 6.0% |
| Huntingtown, MD | 3,029 | 47 | 6.0% |
| Croom, MD | 2,353 | 47 | 6.0% |
| Owings, MD | 2,483 | 47 | 6.0% |
| Bryantown, MD | 464 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Scammon Bay, AK | 464 | 31 | 38.0% |
| Dozier, AL | 464 | 52 | 4.0% |
| Allenspark, CO | 464 | 47 | 6.0% |
| Saguache, CO | 464 | 16 | 68.0% |
| Kenton, DE | 464 | 42 | 16.0% |
| Bryantown, MD | 464 | 47 | 6.0% |
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