| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 37°F | 29°F | 5.6" |
| February | 23°F | 38°F | 29°F | 5.2" |
| March | 32°F | 48°F | 39°F | 3.4" |
| April | 42°F | 60°F | 50°F | 7.5" |
| May | 51°F | 66°F | 57°F | 7.4" |
| June | 59°F | 73°F | 65°F | 8.8" |
| July | 62°F | 76°F | 68°F | 7.0" |
| August | 61°F | 75°F | 67°F | 6.3" |
| September | 55°F | 69°F | 61°F | 8.5" |
| October | 45°F | 60°F | 51°F | 9.1" |
| November | 34°F | 49°F | 41°F | 5.7" |
| December | 28°F | 42°F | 34°F | 5.3" |
| Index | Selma | Virginia | National |
| Air quality index | 38 | 58 | 42 |
| Pollution index | 4,113,590 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 326 |
| Days with moderate air quality | 39 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Hot Springs, VA | 586 | 38 | 24.0% |
| Callaghan, VA | 247 | 38 | 24.0% |
| Iron Gate, VA | 396 | 38 | 24.0% |
| Clifton Forge, VA | 3,534 | 38 | 24.0% |
| Low Moor, VA | 333 | 38 | 24.0% |
| Selma, VA | 495 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Gambell, AK | 495 | 38 | 24.0% |
| Isleton, CA | 495 | 45 | 10.0% |
| Wilkerson, CA | 495 | 47 | 6.0% |
| Ideal, GA | 495 | 39 | 22.0% |
| Hume, IL | 495 | 42 | 16.0% |
| Selma, VA | 495 | 38 | 24.0% |
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