| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 34°F | 54°F | 42°F | 5.1" |
| February | 34°F | 57°F | 44°F | 4.7" |
| March | 41°F | 65°F | 52°F | 5.6" |
| April | 50°F | 75°F | 61°F | 6.5" |
| May | 58°F | 81°F | 69°F | 8.0" |
| June | 67°F | 89°F | 77°F | 7.6" |
| July | 70°F | 91°F | 79°F | 9.7" |
| August | 69°F | 89°F | 77°F | 6.7" |
| September | 63°F | 83°F | 71°F | 9.5" |
| October | 51°F | 74°F | 61°F | 3.5" |
| November | 41°F | 64°F | 51°F | 6.0" |
| December | 37°F | 58°F | 46°F | 6.5" |
| Index | Smithfield | North Carolina | National |
| Air quality index | 40 | 35 | 42 |
| Pollution index | 227,321 | 2,789,538 | 2,726,193 |
| Measurement | Total |
| Days measured | 359 |
| Days with good air quality | 237 |
| Days with moderate air quality | 122 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Micro, NC | 688 | 40 | 20.0% |
| Pine Level, NC | 2,188 | 40 | 20.0% |
| Four Oaks, NC | 2,225 | 40 | 20.0% |
| Princeton, NC | 1,396 | 40 | 20.0% |
| Kenly, NC | 2,385 | 40 | 20.0% |
| Smithfield, NC | 12,697 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Fulton, MO | 12,696 | 38 | 24.0% |
| Crowley, LA | 12,689 | 41 | 18.0% |
| St. Ann, MO | 12,689 | 54 | 8.0% |
| Echelon, NJ | 12,687 | 51 | 2.0% |
| Fort Bliss, TX | 12,709 | 53 | 6.0% |
| Smithfield, NC | 12,697 | 40 | 20.0% |
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