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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 45°F | 35°F | 4.9" |
| February | 27°F | 47°F | 36°F | 2.4" |
| March | 35°F | 58°F | 45°F | 3.4" |
| April | 43°F | 70°F | 56°F | 3.2" |
| May | 51°F | 77°F | 63°F | 6.1" |
| June | 60°F | 84°F | 71°F | 6.8" |
| July | 63°F | 87°F | 74°F | 8.1" |
| August | 62°F | 86°F | 73°F | 4.8" |
| September | 55°F | 80°F | 66°F | 6.1" |
| October | 45°F | 69°F | 55°F | 5.8" |
| November | 35°F | 57°F | 45°F | 1.9" |
| December | 30°F | 49°F | 38°F | 3.6" |
| Index | McCoole | Maryland | National |
| Air quality index | 36 | 43 | 42 |
| Pollution index | 1,427,850 | 5,342,367 | 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 | 0.003% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Detmold, MD | 256 | 36 | 28.0% |
| Swanton, MD | 0 | 36 | 28.0% |
| Piedmont, WV | 928 | 36 | 28.0% |
| Carlos, MD | 58 | 36 | 28.0% |
| Lonaconing, MD | 1,282 | 36 | 28.0% |
| McCoole, MD | 515 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| La Paz Valley, AZ | 515 | 13 | 74.0% |
| Craigmont, ID | 515 | 29 | 42.0% |
| New Boston, IL | 515 | 32 | 36.0% |
| Fancy Farm, KY | 515 | 44 | 12.0% |
| Coopers Plains, NY | 515 | 35 | 30.0% |
| McCoole, MD | 515 | 36 | 28.0% |
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