| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 54°F | 43°F | 3.9" |
| February | 35°F | 58°F | 46°F | 3.0" |
| March | 43°F | 67°F | 54°F | 3.9" |
| April | 51°F | 76°F | 63°F | 4.1" |
| May | 59°F | 81°F | 70°F | 3.8" |
| June | 68°F | 89°F | 78°F | 4.4" |
| July | 71°F | 91°F | 80°F | 4.2" |
| August | 71°F | 89°F | 79°F | 5.5" |
| September | 65°F | 84°F | 73°F | 2.8" |
| October | 52°F | 75°F | 63°F | 3.4" |
| November | 41°F | 65°F | 53°F | 3.2" |
| December | 38°F | 57°F | 47°F | 5.0" |
| Index | Welcome | South Carolina | National |
| Air quality index | 46 | 37 | 42 |
| Pollution index | 7,804,180 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 222 |
| Days with moderate air quality | 141 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.050% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Pelzer, SC | 1,653 | 31 | 38.0% |
| West Pelzer, SC | 1,049 | 31 | 38.0% |
| Williamston, SC | 4,219 | 31 | 38.0% |
| Liberty, SC | 3,168 | 41 | 18.0% |
| Berea, SC | 15,104 | 46 | 8.0% |
| Welcome, SC | 7,743 | 46 | 8.0% |
| City | Population | Air Quality Index | National Avg. |
| Round Lake Park, IL | 7,744 | 39 | 22.0% |
| Hood River, OR | 7,745 | 23 | 54.0% |
| Winnemucca, NV | 7,752 | 14 | 72.0% |
| Floris, VA | 7,752 | 47 | 6.0% |
| Merritt, BC | 7,733 | n/a | |
| Welcome, SC | 7,743 | 46 | 8.0% |
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