| 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 | Montvale | Virginia | National |
| Air quality index | 38 | 58 | 42 |
| Pollution index | 301,204 | 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 | 0.004% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Bedford, VA | 6,790 | 26 | 48.0% |
| Cloverdale, VA | 3,303 | 38 | 24.0% |
| Laymantown, VA | 1,884 | 38 | 24.0% |
| Daleville, VA | 2,816 | 38 | 24.0% |
| Roanoke, VA | 102,987 | 38 | 24.0% |
| Montvale, VA | 502 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Walsh, CO | 502 | 15 | 70.0% |
| Roopville, GA | 502 | 52 | 4.0% |
| Bay View Gardens, IL | 502 | 41 | 18.0% |
| Burnettsville, IN | 502 | 42 | 16.0% |
| Cawood, KY | 502 | 39 | 22.0% |
| Montvale, VA | 502 | 38 | 24.0% |