| 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 | Marietta | 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. |
| Rowland, NC | 1,130 | 30 | 40.0% |
| Fair Bluff, NC | 585 | 30 | 40.0% |
| Proctorville, NC | 197 | 30 | 40.0% |
| Nichols, SC | 228 | 30 | 40.0% |
| Boardman, NC | 315 | 30 | 40.0% |
| Marietta, NC | 146 | 30 | 40.0% |
| City | Population | Air Quality Index | National Avg. |
| Chinese Camp, CA | 146 | 39 | 22.0% |
| Sharpsburg, IA | 146 | 43 | 14.0% |
| Harmon, IL | 146 | 42 | 16.0% |
| Hettick, IL | 146 | 40 | 20.0% |
| Stoy, IL | 146 | 36 | 28.0% |
| Marietta, NC | 146 | 30 | 40.0% |
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