| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 53°F | 43°F | 6.2" |
| February | 35°F | 55°F | 44°F | 5.3" |
| March | 42°F | 63°F | 51°F | 5.1" |
| April | 51°F | 72°F | 61°F | 7.0" |
| May | 60°F | 79°F | 69°F | 3.8" |
| June | 69°F | 86°F | 77°F | 7.4" |
| July | 72°F | 89°F | 80°F | 8.1" |
| August | 71°F | 88°F | 79°F | 10.9" |
| September | 65°F | 82°F | 73°F | 9.4" |
| October | 55°F | 74°F | 64°F | 8.5" |
| November | 43°F | 63°F | 52°F | 5.6" |
| December | 39°F | 57°F | 47°F | 7.4" |
| Index | Plymouth | North Carolina | National |
| Air quality index | 0 | 35 | 42 |
| Pollution index | 491,299 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 352 |
| Days with moderate air quality | 0 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Jamesville, NC | 578 | 0 | 100.0% |
| Edenton, NC | 4,640 | 0 | 100.0% |
| Roper, NC | 757 | 0 | 100.0% |
| Windsor, NC | 3,422 | 0 | 100.0% |
| Plymouth, NC | 3,432 | 0 | 100.0% |
| City | Population | Air Quality Index | National Avg. |
| Six Mile Run, NJ | 3,432 | 41 | 18.0% |
| Dundurn No. 314, SK | 3,432 | n/a | |
| Tutwiler, MS | 3,433 | 43 | 14.0% |
| Salunga, PA | 3,433 | 45 | 10.0% |
| Le Roy, IL | 3,429 | 44 | 12.0% |
| Plymouth, NC | 3,432 | 0 | 100.0% |
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