| 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 | Galesville | Maryland | National |
| Air quality index | 47 | 43 | 42 |
| Pollution index | 1,716,960 | 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 | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.000% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Chesapeake Beach, MD | 5,996 | 41 | 18.0% |
| Tilghman Island, MD | 831 | 41 | 18.0% |
| North Beach, MD | 2,790 | 41 | 18.0% |
| Crownsville, MD | 1,473 | 46 | 8.0% |
| Annapolis, MD | 39,321 | 46 | 8.0% |
| Galesville, MD | 1,262 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Sainte-Marie-Salomé, QC | 1,262 | n/a | |
| Saint-Louis-du-Ha! Ha!, QC | 1,262 | n/a | |
| Marissa, IL | 1,263 | 54 | 8.0% |
| Warrensburg, IL | 1,261 | 44 | 12.0% |
| Madisonville, LA | 1,263 | 30 | 40.0% |
| Galesville, MD | 1,262 | 47 | 6.0% |
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