| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 38°F | 59°F | 47°F | 6.4" |
| February | 36°F | 59°F | 46°F | 6.0" |
| March | 44°F | 69°F | 56°F | 6.8" |
| April | 50°F | 76°F | 62°F | 7.0" |
| May | 58°F | 81°F | 69°F | 3.9" |
| June | 69°F | 88°F | 77°F | 8.6" |
| July | 72°F | 90°F | 79°F | 11.1" |
| August | 74°F | 93°F | 82°F | 11.7" |
| September | 67°F | 89°F | 76°F | 4.0" |
| October | 58°F | 79°F | 67°F | 6.3" |
| November | 44°F | 68°F | 55°F | 4.5" |
| December | 39°F | 61°F | 48°F | 9.6" |
| Index | Oakland | South Carolina | National |
| Air quality index | 43 | 37 | 42 |
| Pollution index | 4,798,360 | 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 | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.001% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Oswego, SC | 197 | 40 | 20.0% |
| East Sumter, SC | 1,208 | 40 | 20.0% |
| Stateburg, SC | 1,912 | 43 | 14.0% |
| Dalzell, SC | 3,086 | 43 | 14.0% |
| Sumter, SC | 39,758 | 43 | 14.0% |
| Oakland, SC | 1,265 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Carey, ID | 1,265 | 20 | 60.0% |
| Riley, KS | 1,265 | 32 | 36.0% |
| New Sarpy, LA | 1,265 | 45 | 10.0% |
| Weidman, MI | 1,265 | 36 | 28.0% |
| North Ballston Spa, NY | 1,265 | 37 | 26.0% |
| Oakland, SC | 1,265 | 43 | 14.0% |
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