| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 54°F | 43°F | 4.1" |
| February | 35°F | 57°F | 45°F | 4.0" |
| March | 43°F | 67°F | 54°F | 4.2" |
| April | 51°F | 75°F | 63°F | 4.1" |
| May | 59°F | 82°F | 70°F | 3.8" |
| June | 67°F | 90°F | 78°F | 3.6" |
| July | 70°F | 91°F | 79°F | 3.9" |
| August | 70°F | 90°F | 79°F | 4.7" |
| September | 64°F | 84°F | 73°F | 4.6" |
| October | 51°F | 75°F | 62°F | 3.4" |
| November | 40°F | 65°F | 52°F | 3.5" |
| December | 38°F | 58°F | 47°F | 5.1" |
| Index | Norcross | Georgia | National |
| Air quality index | 52 | 41 | 42 |
| Pollution index | 13,513,500 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 162 |
| Days with moderate air quality | 184 |
| Days w/ poor A.Q. for sensitive groups | 18 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.170% |
| Benzene | 0.180% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.080% |
| Mercury | 0.005% |
| City | Population | Air Quality Index | National Avg. |
| Buford, GA | 16,003 | 37 | 26.0% |
| Rest Haven, GA | 43 | 37 | 26.0% |
| Sugar Hill, GA | 23,994 | 37 | 26.0% |
| Lawrenceville, GA | 30,125 | 37 | 26.0% |
| Suwanee, GA | 20,444 | 37 | 26.0% |
| Norcross, GA | 16,876 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Southbridge Town, MA | 16,865 | 40 | 20.0% |
| Norwalk, OH | 16,860 | 50 | = 100 |
| Wayne, MI | 16,894 | 56 | 12.0% |
| Moraga, CA | 16,896 | 40 | 20.0% |
| Stafford, TX | 16,904 | 52 | 4.0% |
| Norcross, GA | 16,876 | 52 | 4.0% |
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