| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 50°F | 37°F | 3.0" |
| February | 28°F | 52°F | 39°F | 2.3" |
| March | 37°F | 62°F | 48°F | 3.4" |
| April | 45°F | 73°F | 59°F | 3.8" |
| May | 54°F | 79°F | 66°F | 4.2" |
| June | 63°F | 87°F | 74°F | 5.0" |
| July | 66°F | 89°F | 77°F | 4.8" |
| August | 65°F | 88°F | 76°F | 3.7" |
| September | 58°F | 82°F | 69°F | 4.0" |
| October | 47°F | 72°F | 59°F | 4.2" |
| November | 36°F | 62°F | 48°F | 3.2" |
| December | 31°F | 53°F | 41°F | 3.7" |
| Index | Salem | Virginia | National |
| Air quality index | 38 | 58 | 42 |
| Pollution index | 884,118 | 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 | 0.060% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.020% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Cloverdale, VA | 3,193 | 38 | 24.0% |
| Laymantown, VA | 1,836 | 38 | 24.0% |
| Vinton, VA | 8,102 | 38 | 24.0% |
| Boones Mill, VA | 149 | 38 | 24.0% |
| Daleville, VA | 2,716 | 38 | 24.0% |
| Salem, VA | 25,290 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Clinton, IA | 25,290 | 42 | 16.0% |
| Mount Pleasant, MI | 25,290 | 26 | 48.0% |
| Prince Edward County, ON | 25,289 | n/a | |
| El Cerrito, CA | 25,280 | 40 | 20.0% |
| Franklin, IN | 25,276 | 54 | 8.0% |
| Salem, VA | 25,290 | 38 | 24.0% |
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