| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 56°F | 44°F | 4.2" |
| February | 36°F | 59°F | 46°F | 5.0" |
| March | 43°F | 68°F | 54°F | 5.2" |
| April | 52°F | 77°F | 64°F | 5.0" |
| May | 61°F | 83°F | 71°F | 8.6" |
| June | 70°F | 90°F | 79°F | 7.0" |
| July | 72°F | 92°F | 80°F | 7.9" |
| August | 71°F | 90°F | 79°F | 8.3" |
| September | 65°F | 85°F | 73°F | 9.2" |
| October | 52°F | 76°F | 63°F | 8.9" |
| November | 41°F | 66°F | 52°F | 5.9" |
| December | 39°F | 60°F | 48°F | 5.6" |
| Index | Patrick | 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. |
| Chesterfield, SC | 1,486 | 40 | 20.0% |
| McBee, SC | 977 | 40 | 20.0% |
| Hartsville, SC | 7,559 | 40 | 20.0% |
| North Hartsville, SC | 1,972 | 40 | 20.0% |
| Society Hill, SC | 484 | 40 | 20.0% |
| Patrick, SC | 323 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Manalapan, FL | 323 | 36 | 28.0% |
| Barnum, IA | 323 | 37 | 26.0% |
| Medora, IL | 323 | 54 | 8.0% |
| Stinesville, IN | 323 | 42 | 16.0% |
| Montpelier, LA | 323 | 30 | 40.0% |
| Patrick, SC | 323 | 40 | 20.0% |
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