| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 60°F | 47°F | 2.6" |
| February | 35°F | 59°F | 45°F | 4.9" |
| March | 43°F | 70°F | 54°F | 6.6" |
| April | 49°F | 76°F | 61°F | 4.9" |
| May | 58°F | 81°F | 68°F | 1.8" |
| June | 69°F | 88°F | 76°F | 9.3" |
| July | 71°F | 90°F | 79°F | 6.4" |
| August | 72°F | 94°F | 81°F | 4.9" |
| September | 66°F | 90°F | 76°F | 1.6" |
| October | 56°F | 80°F | 66°F | 9.2" |
| November | 42°F | 69°F | 54°F | 2.1" |
| December | 37°F | 61°F | 47°F | 9.8" |
| Index | Blenheim | South Carolina | National |
| Air quality index | 40 | 37 | 42 |
| Pollution index | 691,074 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 288 |
| Days with moderate air quality | 77 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.003% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Tatum, SC | 276 | 30 | 40.0% |
| Clio, SC | 484 | 30 | 40.0% |
| Scotch Meadows, NC | 427 | 30 | 40.0% |
| McColl, SC | 1,682 | 30 | 40.0% |
| Wallace, SC | 713 | 40 | 20.0% |
| Blenheim, SC | 123 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Cold Bay, AK | 123 | 31 | 38.0% |
| Blue Mountain, AR | 123 | 36 | 28.0% |
| Nicasio, CA | 123 | 40 | 20.0% |
| Vincent, IA | 123 | 37 | 26.0% |
| Princeton, ID | 123 | 10 | 80.0% |
| Blenheim, SC | 123 | 40 | 20.0% |
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