| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 48°F | 37°F | 5.0" |
| February | 29°F | 51°F | 39°F | 4.0" |
| March | 36°F | 59°F | 47°F | 3.7" |
| April | 49°F | 71°F | 60°F | 4.8" |
| May | 57°F | 77°F | 66°F | 5.9" |
| June | 66°F | 85°F | 75°F | 8.1" |
| July | 70°F | 89°F | 79°F | 5.1" |
| August | 67°F | 86°F | 76°F | 6.7" |
| September | 63°F | 81°F | 72°F | 5.6" |
| October | 50°F | 70°F | 60°F | 6.3" |
| November | 38°F | 60°F | 48°F | 6.2" |
| December | 35°F | 54°F | 44°F | 5.8" |
| Index | Chester | Virginia | National |
| Air quality index | 44 | 58 | 42 |
| Pollution index | 391,448 | 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 | 0.003% |
| Benzene | 0.005% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Woodlake, VA | 7,404 | 44 | 12.0% |
| Ettrick, VA | 5,024 | 44 | 12.0% |
| Richmond, VA | 229,233 | 44 | 12.0% |
| Highland Springs, VA | 15,000 | 44 | 12.0% |
| Montrose, VA | 7,639 | 44 | 12.0% |
| Chester, VA | 22,098 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Villa Park, IL | 22,087 | 55 | 10.0% |
| Nixa, MO | 22,086 | 39 | 22.0% |
| Corcoran, CA | 22,078 | 56 | 12.0% |
| Johnston, IA | 22,077 | 39 | 22.0% |
| Huntsville, ON | 22,073 | n/a | |
| Chester, VA | 22,098 | 44 | 12.0% |
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