| 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 | 50 |
| Pollution index | 2,035,010 | 3,848,988 | 5,066,862 |
| 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, State | Population | Air Quality Index | National Avg. |
| Marvin, NC | 6,056 | 49 | 2% |
| Marshville, NC | 2,598 | 49 | 2% |
| Indian Trail, NC | 36,357 | 49 | 2% |
| Stallings, NC | 14,759 | 49 | 2% |
| Fairview CDP, NC | 3,016 | 49 | 2% |
| Monroe, NC | 34,212 | 49 | 2% |
| City, State | Population | Air Quality Index | National Avg. |
| Vestavia Hills, AL | 34,243 | 53 | 6% |
| Wentzville, MO | 34,176 | 54 | 8% |
| Evans, GA | 34,270 | 47 | 6% |
| Cottonwood Heights, UT | 34,274 | 51 | 2% |
| Oildale, CA | 34,277 | 67 | 34% |
| Monroe, NC | 34,212 | 49 | 2% |
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