| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 54°F | 42°F | 2.6" |
| February | 34°F | 57°F | 45°F | 2.2" |
| March | 42°F | 66°F | 53°F | 2.7" |
| April | 50°F | 75°F | 62°F | 2.7" |
| May | 58°F | 81°F | 69°F | 2.9" |
| June | 66°F | 89°F | 77°F | 3.3" |
| July | 69°F | 91°F | 79°F | 3.1" |
| August | 69°F | 90°F | 78°F | 4.1" |
| September | 63°F | 84°F | 72°F | 3.0" |
| October | 50°F | 74°F | 61°F | 2.6" |
| November | 40°F | 64°F | 51°F | 2.9" |
| December | 37°F | 58°F | 46°F | 3.4" |
| Index | Marvin | North Carolina | National |
| Air quality index | 49 | 35 | 42 |
| Pollution index | 13,834,800 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 200 |
| Days with moderate air quality | 147 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.170% |
| Carbon Tetrachloride | 0.050% |
| Lead | 0.030% |
| Mercury | 0.100% |
| City | Population | Air Quality Index | National Avg. |
| JAARS, NC | 1,090 | 49 | 2.0% |
| Lake Wylie, SC | 14,091 | 49 | 2.0% |
| Rock Hill, SC | 74,410 | 49 | 2.0% |
| Mint Hill, NC | 27,258 | 49 | 2.0% |
| Matthews, NC | 32,682 | 49 | 2.0% |
| Marvin, NC | 6,672 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| Lake Murray of Richland, SC | 6,672 | 43 | 14.0% |
| Barnesville, GA | 6,673 | 38 | 24.0% |
| Winthrop Harbor, IL | 6,675 | 39 | 22.0% |
| Raleigh Hills, OR | 6,675 | 38 | 24.0% |
| Medfield, MA | 6,668 | 43 | 14.0% |
| Marvin, NC | 6,672 | 49 | 2.0% |
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