| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 54°F | 42°F | 3.2" |
| February | 33°F | 57°F | 45°F | 2.5" |
| March | 41°F | 66°F | 53°F | 3.7" |
| April | 50°F | 75°F | 62°F | 3.9" |
| May | 57°F | 81°F | 69°F | 4.3" |
| June | 66°F | 89°F | 76°F | 3.6" |
| July | 69°F | 90°F | 78°F | 3.6" |
| August | 69°F | 90°F | 78°F | 4.2" |
| September | 63°F | 84°F | 72°F | 4.1" |
| October | 50°F | 74°F | 61°F | 2.7" |
| November | 39°F | 65°F | 51°F | 3.4" |
| December | 36°F | 58°F | 46°F | 4.3" |
| Index | Smyrna | South Carolina | National |
| Air quality index | 36 | 37 | 42 |
| Pollution index | 1,726,850 | 3,620,438 | 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.003% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| East Gaffney, SC | 3,043 | 36 | 28.0% |
| Sharon, SC | 590 | 36 | 28.0% |
| Grover, NC | 588 | 36 | 28.0% |
| Gastonia, NC | 76,635 | 36 | 28.0% |
| Gaffney, SC | 12,733 | 36 | 28.0% |
| Smyrna, SC | 26 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Ko Vaya, AZ | 26 | 47 | 6.0% |
| Alderpoint, CA | 26 | 27 | 46.0% |
| Macdoel, CA | 26 | 29 | 42.0% |
| Towner, CO | 26 | 15 | 70.0% |
| Boykin, GA | 26 | 35 | 30.0% |
| Smyrna, SC | 26 | 36 | 28.0% |
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