| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 37°F | 57°F | 46°F | 7.9" |
| February | 37°F | 57°F | 47°F | 6.8" |
| March | 44°F | 68°F | 56°F | 8.2" |
| April | 50°F | 72°F | 62°F | 8.2" |
| May | 58°F | 80°F | 71°F | 3.5" |
| June | 68°F | 87°F | 78°F | 5.7" |
| July | 71°F | 87°F | 79°F | 16.7" |
| August | 73°F | 92°F | 83°F | 13.7" |
| September | 67°F | 86°F | 75°F | 4.8" |
| October | 55°F | 76°F | 64°F | 7.6" |
| November | 43°F | 65°F | 53°F | 5.7" |
| December | 37°F | 56°F | 46°F | 6.4" |
| Index | Hiram | Georgia | National |
| Air quality index | 52 | 41 | 42 |
| Pollution index | 14,162,500 | 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 | 0.220% |
| Benzene | 0.180% |
| Carbon Tetrachloride | 0.040% |
| Lead | 0.100% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Braswell, GA | 375 | 44 | 12.0% |
| Taylorsville, GA | 319 | 44 | 12.0% |
| Lithia Springs, GA | 17,545 | 52 | 4.0% |
| Dallas, GA | 13,680 | 52 | 4.0% |
| Woodstock, GA | 32,310 | 52 | 4.0% |
| Hiram, GA | 4,021 | 52 | 4.0% |
| City | Population | Air Quality Index | National Avg. |
| Granite Hills, CA | 4,020 | 64 | 28.0% |
| Schnecksville, PA | 4,022 | 42 | 16.0% |
| Smithton, IL | 4,019 | 54 | 8.0% |
| Meridian, PA | 4,023 | 31 | 38.0% |
| Oak Valley, NJ | 4,018 | 51 | 2.0% |
| Hiram, GA | 4,021 | 52 | 4.0% |
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