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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 22°F | 38°F | 30°F | 2.9" | 
| February | 23°F | 40°F | 30°F | 2.0" | 
| March | 32°F | 52°F | 41°F | 3.5" | 
| April | 42°F | 65°F | 53°F | 3.3" | 
| May | 51°F | 73°F | 62°F | 4.2" | 
| June | 59°F | 80°F | 69°F | 4.5" | 
| July | 63°F | 84°F | 73°F | 3.6" | 
| August | 62°F | 83°F | 72°F | 3.9" | 
| September | 55°F | 77°F | 65°F | 3.3" | 
| October | 45°F | 65°F | 54°F | 3.6" | 
| November | 35°F | 54°F | 44°F | 2.6" | 
| December | 27°F | 43°F | 34°F | 3.6" | 
| Index | Wellsburg | West Virginia | National | 
| Air quality index | 46 | 126 | 42 | 
| Pollution index | 1,410,280 | 1,996,538 | 2,726,193 | 
| Measurement | Total | 
| Days measured | 365 | 
| Days with good air quality | 217 | 
| Days with moderate air quality | 144 | 
| Days w/ poor A.Q. for sensitive groups | 4 | 
| Days with unhealthy air quality | 0 | 
| Pollutant | Total | 
| Arsenic | 0.002% | 
| Benzene | 0.010% | 
| Carbon Tetrachloride | 0.002% | 
| Lead | 0.001% | 
| Mercury | 0.004% | 
| City | Population | Air Quality Index | National Avg. | 
| Brookside, OH | 870 | 39 | 22.0% | 
| Wolfhurst, OH | 1,165 | 39 | 22.0% | 
| Harrisville, OH | 156 | 39 | 22.0% | 
| Valley Grove, WV | 390 | 39 | 22.0% | 
| West Alexander, PA | 412 | 39 | 22.0% | 
| Wellsburg, WV | 2,090 | 46 | 8.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Rockwell, NC | 2,090 | 40 | 20.0% | 
| Craigsville, WV | 2,090 | 295 | 490.0% | 
| L'Anse, MI | 2,091 | 8 | 84.0% | 
| Lewiston, UT | 2,091 | 44 | 12.0% | 
| Chester, CA | 2,088 | 46 | 8.0% | 
| Wellsburg, WV | 2,090 | 46 | 8.0% |