| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 44°F | 37°F | 2.7" |
| February | 32°F | 45°F | 38°F | 2.7" |
| March | 40°F | 55°F | 47°F | 3.4" |
| April | 51°F | 68°F | 59°F | 3.8" |
| May | 60°F | 76°F | 67°F | 3.9" |
| June | 70°F | 86°F | 77°F | 4.5" |
| July | 75°F | 90°F | 82°F | 5.0" |
| August | 73°F | 87°F | 79°F | 4.6" |
| September | 67°F | 80°F | 73°F | 4.4" |
| October | 55°F | 69°F | 62°F | 4.6" |
| November | 45°F | 58°F | 50°F | 2.4" |
| December | 37°F | 48°F | 42°F | 4.1" |
| Index | Parkville | Maryland | National |
| Air quality index | 46 | 43 | 42 |
| Pollution index | 9,823,920 | 5,342,367 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 223 |
| Days with moderate air quality | 129 |
| Days w/ poor A.Q. for sensitive groups | 13 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.030% |
| Mercury | 0.140% |
| City | Population | Air Quality Index | National Avg. |
| Ferndale, MD | 17,732 | 46 | 8.0% |
| Bel Air, MD | 10,102 | 46 | 8.0% |
| Edgewood, MD | 25,065 | 46 | 8.0% |
| Kingsville, MD | 4,649 | 46 | 8.0% |
| Baltimore, MD | 602,274 | 46 | 8.0% |
| Parkville, MD | 30,459 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Holladay, UT | 30,461 | 51 | 2.0% |
| Atascadero, CA | 30,444 | 46 | 8.0% |
| Cochrane, AB | 30,481 | n/a | |
| Kingman, AZ | 30,433 | 13 | 74.0% |
| Long Branch, NJ | 30,424 | 51 | 2.0% |
| Parkville, MD | 30,459 | 46 | 8.0% |
Here are the best places to live in Maryland
Check out the 10 safest cities in Maryland
See the best places to live in Parkville
Check out the 10 most dangerous cities in Maryland