| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 56°F | 44°F | 3.4" |
| February | 35°F | 59°F | 46°F | 2.8" |
| March | 42°F | 68°F | 54°F | 3.3" |
| April | 50°F | 77°F | 63°F | 2.7" |
| May | 58°F | 83°F | 70°F | 3.1" |
| June | 67°F | 90°F | 78°F | 3.1" |
| July | 70°F | 92°F | 80°F | 2.8" |
| August | 69°F | 91°F | 79°F | 3.4" |
| September | 63°F | 85°F | 73°F | 3.0" |
| October | 50°F | 76°F | 62°F | 3.3" |
| November | 39°F | 66°F | 51°F | 3.1" |
| December | 37°F | 59°F | 47°F | 5.0" |
| Index | Waterloo | South Carolina | National |
| Air quality index | 31 | 37 | 42 |
| Pollution index | 1,755,840 | 3,620,438 | 2,726,193 |
| Measurement | Total |
| Days measured | 250 |
| Days with good air quality | 248 |
| Days with moderate air quality | 2 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.003% |
| City | Population | Air Quality Index | National Avg. |
| Hodges, SC | 226 | 31 | 38.0% |
| Cross Hill, SC | 556 | 31 | 38.0% |
| Cokesbury, SC | 432 | 31 | 38.0% |
| Princeton, SC | 60 | 31 | 38.0% |
| Coronaca, SC | 81 | 31 | 38.0% |
| Waterloo, SC | 181 | 31 | 38.0% |
| City | Population | Air Quality Index | National Avg. |
| Gulfcrest, AL | 181 | 42 | 16.0% |
| Humnoke, AR | 181 | 45 | 10.0% |
| Beaver Valley, AZ | 181 | 60 | 20.0% |
| Olancha, CA | 181 | 66 | 32.0% |
| Bristow, IA | 181 | 15 | 70.0% |
| Waterloo, SC | 181 | 31 | 38.0% |
Here are the best places to live in South Carolina
See the best places to live in Waterloo
Safest Cities In The US
These are the largest cities in South Carolina