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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 60°F | 47°F | 3.0" |
| February | 38°F | 62°F | 49°F | 3.8" |
| March | 45°F | 71°F | 57°F | 3.0" |
| April | 53°F | 78°F | 65°F | 3.2" |
| May | 60°F | 84°F | 72°F | 3.5" |
| June | 69°F | 91°F | 79°F | 4.4" |
| July | 71°F | 93°F | 80°F | 6.1" |
| August | 72°F | 91°F | 80°F | 4.3" |
| September | 66°F | 87°F | 75°F | 3.9" |
| October | 54°F | 78°F | 65°F | 3.8" |
| November | 43°F | 68°F | 54°F | 2.7" |
| December | 41°F | 63°F | 51°F | 4.2" |
| Index | St. Matthews | South Carolina | National |
| Air quality index | 43 | 37 | 42 |
| Pollution index | 783,589 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 264 |
| Days with moderate air quality | 99 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| 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. |
| Edisto, SC | 1,993 | 43 | 14.0% |
| Eastover, SC | 686 | 43 | 14.0% |
| Elloree, SC | 955 | 43 | 14.0% |
| Gadsden, SC | 983 | 43 | 14.0% |
| Brookdale, SC | 4,740 | 43 | 14.0% |
| St. Matthews, SC | 2,400 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Dover, AR | 2,400 | 36 | 28.0% |
| Fort Polk North, LA | 2,400 | 30 | 40.0% |
| Russell-Binscarth, MB | 2,400 | n/a | |
| Eatonville, FL | 2,399 | 39 | 22.0% |
| West Wareham, MA | 2,398 | 36 | 28.0% |
| St. Matthews, SC | 2,400 | 43 | 14.0% |
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