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				| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation | 
| January | 38°F | 64°F | 50°F | 2.9" | 
| February | 39°F | 66°F | 51°F | 3.7" | 
| March | 45°F | 72°F | 58°F | 3.1" | 
| April | 53°F | 80°F | 66°F | 3.4" | 
| May | 62°F | 85°F | 73°F | 3.4" | 
| June | 70°F | 91°F | 79°F | 6.6" | 
| July | 73°F | 92°F | 82°F | 6.5" | 
| August | 73°F | 91°F | 81°F | 8.0" | 
| September | 68°F | 87°F | 76°F | 5.9" | 
| October | 56°F | 80°F | 67°F | 5.6" | 
| November | 45°F | 72°F | 57°F | 2.9" | 
| December | 42°F | 67°F | 53°F | 3.7" | 
| Index | Mount Pleasant | South Carolina | National | 
| Air quality index | 38 | 37 | 42 | 
| Pollution index | 783,589 | 3,620,438 | 2,726,193 | 
| Measurement | Total | 
| Days measured | 355 | 
| Days with good air quality | 299 | 
| Days with moderate air quality | 55 | 
| Days w/ poor A.Q. for sensitive groups | 1 | 
| Days with unhealthy air quality | 0 | 
| Pollutant | Total | 
| Arsenic | 0.001% | 
| Benzene | 0.010% | 
| Carbon Tetrachloride | 0.001% | 
| Lead | 0.003% | 
| Mercury | 0.000% | 
| City | Population | Air Quality Index | National Avg. | 
| Charleston, SC | 137,041 | 38 | 24.0% | 
| Isle of Palms, SC | 4,371 | 38 | 24.0% | 
| Awendaw, SC | 1,744 | 38 | 24.0% | 
| Folly Beach, SC | 2,664 | 38 | 24.0% | 
| James Island, SC | 12,157 | 38 | 24.0% | 
| Mount Pleasant, SC | 89,410 | 38 | 24.0% | 
| City | Population | Air Quality Index | National Avg. | 
| Miami Beach, FL | 89,439 | 41 | 18.0% | 
| Peterborough, ON | 89,500 | n/a | |
| Germantown, MD | 89,529 | 47 | 6.0% | 
| Fall River, MA | 89,618 | 44 | 12.0% | 
| Chino, CA | 89,170 | 89 | 78.0% | 
| Mount Pleasant, SC | 89,410 | 38 | 24.0% |