| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 41°F | 58°F | 49°F | 2.3" |
| February | 44°F | 63°F | 52°F | 0.6" |
| March | 50°F | 68°F | 58°F | 0.5" |
| April | 59°F | 75°F | 67°F | 2.2" |
| May | 67°F | 82°F | 74°F | 6.5" |
| June | 74°F | 88°F | 81°F | 3.0" |
| July | 76°F | 90°F | 82°F | 5.3" |
| August | 75°F | 89°F | 81°F | 3.9" |
| September | 70°F | 85°F | 77°F | 4.9" |
| October | 60°F | 78°F | 68°F | 0.7" |
| November | 48°F | 68°F | 56°F | 0.8" |
| December | 46°F | 63°F | 53°F | 3.8" |
| Index | Walterboro | South Carolina | National |
| Air quality index | 29 | 37 | 42 |
| Pollution index | 6,343,880 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 7 |
| Days with good air quality | 7 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.050% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.090% |
| Lead | 0.010% |
| Mercury | 0.100% |
| City | Population | Air Quality Index | National Avg. |
| Yemassee, SC | 870 | 29 | 42.0% |
| Cottageville, SC | 1,090 | 29 | 42.0% |
| Smoaks, SC | 95 | 29 | 42.0% |
| Jacksonboro, SC | 200 | 29 | 42.0% |
| Williams, SC | 194 | 29 | 42.0% |
| Walterboro, SC | 5,417 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| West Pleasant View, CO | 5,417 | 58 | 16.0% |
| Willow Creek No. 26, AB | 5,418 | n/a | |
| Starke, FL | 5,415 | 35 | 30.0% |
| Algona, IA | 5,415 | 15 | 70.0% |
| Davenport, FL | 5,420 | 36 | 28.0% |
| Walterboro, SC | 5,417 | 29 | 42.0% |
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