| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 40°F | 33°F | 10.7" |
| February | 21°F | 34°F | 28°F | 2.7" |
| March | 31°F | 48°F | 40°F | 6.7" |
| April | 39°F | 59°F | 51°F | 4.2" |
| May | 48°F | 71°F | 62°F | 4.3" |
| June | 59°F | 80°F | 72°F | 7.9" |
| July | 63°F | 82°F | 74°F | 6.2" |
| August | 64°F | 82°F | 75°F | 13.8" |
| September | 56°F | 78°F | 69°F | 6.2" |
| October | 47°F | 66°F | 57°F | 6.5" |
| November | 35°F | 53°F | 44°F | 5.9" |
| December | 27°F | 38°F | 33°F | 2.9" |
| Index | Garrett | Pennsylvania | National |
| Air quality index | 36 | 45 | 42 |
| Pollution index | 2,970,510 | 4,584,805 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 340 |
| Days with moderate air quality | 19 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.650% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Corriganville, MD | 619 | 36 | 28.0% |
| Frostburg, MD | 8,550 | 36 | 28.0% |
| Addison, PA | 266 | 36 | 28.0% |
| Salisbury, PA | 702 | 36 | 28.0% |
| Casselman, PA | 66 | 36 | 28.0% |
| Garrett, PA | 430 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Bellflower, IL | 430 | 42 | 16.0% |
| Chandlerville, IL | 430 | 40 | 20.0% |
| Hope, KS | 430 | 32 | 36.0% |
| Friendsville, MD | 430 | 36 | 28.0% |
| Gunnison, MS | 430 | 43 | 14.0% |
| Garrett, PA | 430 | 36 | 28.0% |
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