| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 32°F | 58°F | 44°F | 4.2" |
| February | 34°F | 61°F | 46°F | 3.9" |
| March | 41°F | 70°F | 55°F | 4.3" |
| April | 49°F | 78°F | 63°F | 4.1" |
| May | 57°F | 84°F | 70°F | 3.4" |
| June | 66°F | 91°F | 78°F | 4.0" |
| July | 69°F | 93°F | 79°F | 4.5" |
| August | 69°F | 92°F | 79°F | 5.0" |
| September | 63°F | 87°F | 73°F | 3.8" |
| October | 50°F | 77°F | 62°F | 4.1" |
| November | 39°F | 67°F | 52°F | 3.4" |
| December | 36°F | 60°F | 47°F | 5.9" |
| Index | Royston | Georgia | National |
| Air quality index | 44 | 41 | 42 |
| Pollution index | 770,308 | 1,874,972 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 245 |
| Days with moderate air quality | 120 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Hartwell, GA | 4,553 | 31 | 38.0% |
| Eagle Grove, GA | 0 | 31 | 38.0% |
| Reed Creek, GA | 2,852 | 31 | 38.0% |
| Canon, GA | 1,085 | 41 | 18.0% |
| Gumlog, GA | 2,430 | 41 | 18.0% |
| Royston, GA | 3,117 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Wyoming, PA | 3,116 | 38 | 24.0% |
| East Gaffney, SC | 3,116 | 36 | 28.0% |
| South Pittsburg, TN | 3,116 | 46 | 8.0% |
| Longtown, OK | 3,118 | 43 | 14.0% |
| Gloverville, SC | 3,118 | 47 | 6.0% |
| Royston, GA | 3,117 | 44 | 12.0% |
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