| 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 | John Marshall | Richmond | Virginia |
| Air quality index | 44 | 44 | 58 |
| Pollution index | 5,336,070 | 93,686 | 1,561,881 |
| 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 | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Dumbarton, VA | 8,411 | 44 | 12.0% |
| Laurel, VA | 17,678 | 44 | 12.0% |
| East Highland Park, VA | 16,499 | 44 | 12.0% |
| Montrose, VA | 7,639 | 44 | 12.0% |
| Tuckahoe, VA | 48,517 | 44 | 12.0% |
| Richmond, VA | 229,233 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Boise, ID | 228,057 | 36 | 28.0% |
| Windsor, ON | 230,583 | n/a | |
| Hialeah, FL | 233,876 | 41 | 18.0% |
| Fremont, CA | 234,829 | 43 | 14.0% |
| Richmond, BC | 222,489 | n/a | |
| Richmond, VA | 229,233 | 44 | 12.0% |
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