| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 36°F | 29°F | 4.0" |
| February | 23°F | 36°F | 29°F | 3.7" |
| March | 33°F | 50°F | 40°F | 5.2" |
| April | 44°F | 63°F | 52°F | 4.8" |
| May | 54°F | 70°F | 61°F | 5.1" |
| June | 61°F | 77°F | 68°F | 5.8" |
| July | 66°F | 81°F | 73°F | 4.0" |
| August | 64°F | 79°F | 71°F | 4.3" |
| September | 56°F | 70°F | 62°F | 4.4" |
| October | 48°F | 62°F | 55°F | 5.6" |
| November | 37°F | 51°F | 43°F | 3.8" |
| December | 29°F | 41°F | 35°F | 5.0" |
| Index | Walkersville | Maryland | National |
| Air quality index | 40 | 43 | 42 |
| Pollution index | 5,553,870 | 5,342,367 | 2,726,193 |
| Measurement | Total |
| Days measured | 362 |
| Days with good air quality | 306 |
| Days with moderate air quality | 54 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.410% |
| Mercury | 0.070% |
| City | Population | Air Quality Index | National Avg. |
| Ballenger Creek, MD | 21,484 | 40 | 20.0% |
| Buckeystown, MD | 1,289 | 40 | 20.0% |
| Linganore, MD | 9,988 | 40 | 20.0% |
| Point of Rocks, MD | 2,067 | 40 | 20.0% |
| Urbana, MD | 12,362 | 40 | 20.0% |
| Walkersville, MD | 6,306 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| California, PA | 6,306 | 56 | 12.0% |
| Deschutes River Woods, OR | 6,305 | 20 | 60.0% |
| Huntington Woods, MI | 6,303 | 56 | 12.0% |
| Clarenville, NL | 6,303 | n/a | |
| Rancho Calaveras, CA | 6,310 | 45 | 10.0% |
| Walkersville, MD | 6,306 | 40 | 20.0% |
Here are the best places to live in Maryland
These are the 10 most affordable cities in Maryland
10 Best cities in Maryland for employment
Check out the 10 safest cities in Maryland