| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 45°F | 35°F | 4.8" |
| February | 28°F | 47°F | 36°F | 6.4" |
| March | 36°F | 57°F | 46°F | 6.0" |
| April | 45°F | 68°F | 56°F | 6.7" |
| May | 55°F | 76°F | 65°F | 6.5" |
| June | 64°F | 84°F | 74°F | 8.6" |
| July | 68°F | 88°F | 78°F | 8.7" |
| August | 66°F | 86°F | 76°F | 7.5" |
| September | 60°F | 80°F | 69°F | 8.6" |
| October | 49°F | 69°F | 58°F | 8.1" |
| November | 38°F | 58°F | 47°F | 7.5" |
| December | 32°F | 50°F | 40°F | 7.1" |
| Index | Marlow Heights | Maryland | National |
| Air quality index | 47 | 43 | 42 |
| Pollution index | 849,185 | 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 | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Baden, MD | 1,574 | 47 | 6.0% |
| Crofton, MD | 29,482 | 47 | 6.0% |
| Dunkirk, MD | 2,175 | 47 | 6.0% |
| Largo, MD | 11,633 | 47 | 6.0% |
| Melwood, MD | 3,923 | 47 | 6.0% |
| Marlow Heights, MD | 5,872 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Snowflake, AZ | 5,873 | 44 | 12.0% |
| Camino Tassajara, CA | 5,870 | 40 | 20.0% |
| High Springs, FL | 5,875 | 35 | 30.0% |
| International Falls, MN | 5,876 | 35 | 30.0% |
| Jamesburg, NJ | 5,876 | 41 | 18.0% |
| Marlow Heights, MD | 5,872 | 47 | 6.0% |
Here are the best places to live in Maryland
These are the 10 cheapest cities in Maryland
These are the largest cities in Maryland
Check out the 10 safest cities in Maryland