| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 52°F | 39°F | 3.2" |
| February | 29°F | 54°F | 41°F | 2.5" |
| March | 37°F | 63°F | 49°F | 3.7" |
| April | 46°F | 75°F | 60°F | 3.7" |
| May | 55°F | 80°F | 67°F | 4.2" |
| June | 65°F | 89°F | 76°F | 4.5" |
| July | 69°F | 92°F | 80°F | 4.6" |
| August | 68°F | 90°F | 78°F | 5.4" |
| September | 61°F | 84°F | 72°F | 4.7" |
| October | 49°F | 74°F | 61°F | 4.2" |
| November | 38°F | 64°F | 50°F | 3.7" |
| December | 33°F | 55°F | 43°F | 4.3" |
| Index | Montrose | Virginia | National |
| Air quality index | 44 | 58 | 42 |
| Pollution index | 6,505,420 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 272 |
| Days with moderate air quality | 93 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.150% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.050% |
| Mercury | 0.004% |
| City | Population | Air Quality Index | National Avg. |
| Mechanicsville, VA | 37,141 | 44 | 12.0% |
| Wyndham, VA | 11,656 | 44 | 12.0% |
| Chamberlayne, VA | 5,116 | 44 | 12.0% |
| Innsbrook, VA | 9,081 | 44 | 12.0% |
| Meadowbrook, VA | 19,675 | 44 | 12.0% |
| Montrose, VA | 7,639 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Bernardsville, NJ | 7,641 | 51 | 2.0% |
| Park City, IL | 7,636 | 39 | 22.0% |
| Milan, TN | 7,642 | 27 | 46.0% |
| Three Rivers, MI | 7,644 | 38 | 24.0% |
| Kaufman, TX | 7,646 | 51 | 2.0% |
| Montrose, VA | 7,639 | 44 | 12.0% |
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