| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 40°F | 62°F | 50°F | 2.8" |
| February | 41°F | 64°F | 52°F | 3.8" |
| March | 48°F | 71°F | 59°F | 4.2" |
| April | 56°F | 79°F | 67°F | 3.9" |
| May | 64°F | 85°F | 74°F | 3.5" |
| June | 71°F | 90°F | 80°F | 4.8" |
| July | 74°F | 93°F | 82°F | 4.8" |
| August | 74°F | 91°F | 82°F | 7.7" |
| September | 69°F | 87°F | 77°F | 4.7" |
| October | 59°F | 79°F | 68°F | 3.9" |
| November | 47°F | 70°F | 58°F | 2.1" |
| December | 44°F | 66°F | 54°F | 3.3" |
| Index | Estill | South Carolina | National |
| Air quality index | 29 | 37 | 42 |
| Pollution index | 533,195 | 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 | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Brunson, SC | 481 | 29 | 42.0% |
| Scotia, SC | 191 | 29 | 42.0% |
| Fairfax, SC | 2,241 | 29 | 42.0% |
| Furman, SC | 622 | 29 | 42.0% |
| Gifford, SC | 203 | 29 | 42.0% |
| Estill, SC | 2,759 | 29 | 42.0% |
| City | Population | Air Quality Index | National Avg. |
| Caledonia, MN | 2,759 | 35 | 30.0% |
| Rio Grande, NJ | 2,759 | 40 | 20.0% |
| Saint-Anicet, QC | 2,759 | n/a | |
| Eagle Lake, FL | 2,758 | 36 | 28.0% |
| Lakeside Park, KY | 2,758 | 54 | 8.0% |
| Estill, SC | 2,759 | 29 | 42.0% |
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