| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 36°F | 59°F | 46°F | 3.0" |
| February | 38°F | 62°F | 49°F | 3.4" |
| March | 45°F | 70°F | 57°F | 3.2" |
| April | 54°F | 79°F | 66°F | 2.8" |
| May | 62°F | 85°F | 73°F | 3.4" |
| June | 70°F | 92°F | 80°F | 4.6" |
| July | 73°F | 94°F | 82°F | 4.7" |
| August | 73°F | 92°F | 81°F | 5.5" |
| September | 67°F | 87°F | 76°F | 4.2" |
| October | 55°F | 78°F | 65°F | 4.0" |
| November | 43°F | 68°F | 54°F | 2.8" |
| December | 41°F | 63°F | 50°F | 4.3" |
| Index | Winnsboro | South Carolina | National |
| Air quality index | 43 | 37 | 42 |
| Pollution index | 1,152,050 | 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 | 0.002% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ridgeway, SC | 294 | 43 | 14.0% |
| Peak, SC | 54 | 43 | 14.0% |
| Winnsboro Mills, SC | 2,099 | 43 | 14.0% |
| Great Falls, SC | 1,806 | 43 | 14.0% |
| Chapin, SC | 1,698 | 43 | 14.0% |
| Winnsboro, SC | 3,208 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Buzzards Bay, MA | 3,208 | 36 | 28.0% |
| Jackson, MN | 3,208 | 32 | 36.0% |
| Pleasant Gap, PA | 3,208 | 44 | 12.0% |
| Hilliard, FL | 3,207 | 43 | 14.0% |
| Algona, WA | 3,207 | 45 | 10.0% |
| Winnsboro, SC | 3,208 | 43 | 14.0% |
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