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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 31°F | 52°F | 41°F | 8.3" | 
| February | 33°F | 56°F | 44°F | 5.5" | 
| March | 41°F | 65°F | 52°F | 4.6" | 
| April | 49°F | 74°F | 61°F | 11.8" | 
| May | 57°F | 80°F | 68°F | 10.6" | 
| June | 66°F | 87°F | 76°F | 5.9" | 
| July | 68°F | 89°F | 77°F | 6.8" | 
| August | 67°F | 87°F | 76°F | 6.1" | 
| September | 61°F | 81°F | 71°F | 11.6" | 
| October | 49°F | 72°F | 60°F | 8.6" | 
| November | 39°F | 63°F | 50°F | 11.0" | 
| December | 36°F | 56°F | 45°F | 12.8" | 
| Index | Shelby | North Carolina | National | 
| Air quality index | 36 | 35 | 42 | 
| Pollution index | 3,495,600 | 2,789,538 | 2,726,193 | 
| Measurement | Total | 
| Days measured | 246 | 
| Days with good air quality | 231 | 
| Days with moderate air quality | 15 | 
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality | 
| Pollutant | Total | 
| Arsenic | 0.080% | 
| Benzene | 0.020% | 
| Carbon Tetrachloride | 0.010% | 
| Lead | 0.060% | 
| Mercury | 0.040% | 
| City | Population | Air Quality Index | National Avg. | 
| Cherryville, NC | 6,018 | 36 | 28.0% | 
| Light Oak, NC | 873 | 36 | 28.0% | 
| Boiling Springs, NC | 4,580 | 36 | 28.0% | 
| Ellenboro, NC | 794 | 36 | 28.0% | 
| Lattimore, NC | 652 | 36 | 28.0% | 
| Shelby, NC | 20,046 | 36 | 28.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Punta Gorda, FL | 20,044 | 36 | 28.0% | 
| Amherst Center, MA | 20,037 | 40 | 20.0% | 
| West Chester, PA | 20,033 | 51 | 2.0% | 
| Glassboro, NJ | 20,069 | 40 | 20.0% | 
| Port Angeles, WA | 20,071 | 34 | 32.0% | 
| Shelby, NC | 20,046 | 36 | 28.0% |