| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 35°F | 56°F | 45°F | 6.9" |
| February | 33°F | 55°F | 43°F | 4.8" |
| March | 41°F | 67°F | 53°F | 7.5" |
| April | 47°F | 73°F | 59°F | 5.2" |
| May | 54°F | 79°F | 67°F | 2.6" |
| June | 65°F | 86°F | 75°F | 10.3" |
| July | 69°F | 89°F | 78°F | 7.2" |
| August | 71°F | 93°F | 81°F | 5.1" |
| September | 63°F | 87°F | 74°F | 3.8" |
| October | 54°F | 76°F | 64°F | 10.6" |
| November | 39°F | 66°F | 52°F | 2.9" |
| December | 35°F | 57°F | 45°F | 7.2" |
| Index | Monroe | North Carolina | National |
| Air quality index | 49 | 35 | 42 |
| Pollution index | 2,035,010 | 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 | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Marvin, NC | 6,672 | 49 | 2.0% |
| Marshville, NC | 2,748 | 49 | 2.0% |
| Indian Trail, NC | 39,644 | 49 | 2.0% |
| Stallings, NC | 15,781 | 49 | 2.0% |
| Fairview CDP, NC | 3,016 | 49 | 2.0% |
| Monroe, NC | 35,339 | 49 | 2.0% |
| City | Population | Air Quality Index | National Avg. |
| La Porte, TX | 35,340 | 52 | 4.0% |
| Lufkin, TX | 35,336 | 36 | 28.0% |
| Olney, MD | 35,350 | 47 | 6.0% |
| Moose Jaw, SK | 35,355 | n/a | |
| Carrollwood, FL | 35,360 | 43 | 14.0% |
| Monroe, NC | 35,339 | 49 | 2.0% |
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