| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 57°F | 45°F | 2.5" |
| February | 36°F | 59°F | 47°F | 3.7" |
| March | 42°F | 67°F | 54°F | 3.4" |
| April | 50°F | 76°F | 63°F | 3.8" |
| May | 58°F | 84°F | 70°F | 4.6" |
| June | 68°F | 91°F | 78°F | 5.3" |
| July | 71°F | 92°F | 80°F | 5.3" |
| August | 71°F | 91°F | 79°F | 5.9" |
| September | 64°F | 86°F | 74°F | 4.3" |
| October | 52°F | 77°F | 63°F | 2.4" |
| November | 41°F | 67°F | 53°F | 3.6" |
| December | 38°F | 61°F | 48°F | 3.9" |
| Index | McDonald | North Carolina | National |
| Air quality index | 30 | 35 | 42 |
| Pollution index | 940,521 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 117 |
| Days with good air quality | 101 |
| Days with moderate air quality | 16 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| 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. |
| Lumberton, NC | 20,704 | 30 | 40.0% |
| Prospect, NC | 810 | 30 | 40.0% |
| Boardman, NC | 315 | 30 | 40.0% |
| Proctorville, NC | 197 | 30 | 40.0% |
| Elrod, NC | 522 | 30 | 40.0% |
| McDonald, NC | 111 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Myrtlewood, AL | 111 | 36 | 28.0% |
| Gum Springs, AR | 111 | 32 | 36.0% |
| Success, AR | 111 | 26 | 48.0% |
| Gazelle, CA | 111 | 36 | 28.0% |
| Orchard, CO | 111 | 45 | 10.0% |
| McDonald, NC | 111 | 30 | 40.0% |
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