| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 54°F | 43°F | 5.9" |
| February | 36°F | 59°F | 46°F | 5.5" |
| March | 43°F | 67°F | 54°F | 5.3" |
| April | 52°F | 76°F | 63°F | 6.6" |
| May | 60°F | 83°F | 71°F | 7.1" |
| June | 67°F | 91°F | 78°F | 7.7" |
| July | 71°F | 91°F | 80°F | 5.5" |
| August | 70°F | 90°F | 79°F | 7.1" |
| September | 64°F | 85°F | 74°F | 10.4" |
| October | 52°F | 75°F | 63°F | 8.3" |
| November | 41°F | 64°F | 52°F | 8.4" |
| December | 38°F | 59°F | 47°F | 7.7" |
| Index | McFarlan | North Carolina | National |
| Air quality index | 40 | 35 | 42 |
| Pollution index | 691,074 | 2,789,538 | 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% |
| Wallace, SC | 713 | 40 | 20.0% |
| Ruby, SC | 304 | 40 | 20.0% |
| Morven, NC | 477 | 40 | 20.0% |
| Cheraw, SC | 5,596 | 40 | 20.0% |
| McFarlan, NC | 92 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Rock House, AZ | 92 | 44 | 12.0% |
| Big Lagoon, CA | 92 | 27 | 46.0% |
| Ricketts, IA | 92 | 35 | 30.0% |
| Bishop Hill, IL | 92 | 46 | 8.0% |
| Mount Auburn, IN | 92 | 28 | 44.0% |
| McFarlan, NC | 92 | 40 | 20.0% |
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