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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 51°F | 39°F | 3.2" |
| February | 30°F | 54°F | 41°F | 2.3" |
| March | 38°F | 63°F | 50°F | 3.4" |
| April | 46°F | 73°F | 59°F | 3.6" |
| May | 54°F | 79°F | 66°F | 4.5" |
| June | 63°F | 87°F | 75°F | 4.2" |
| July | 68°F | 90°F | 78°F | 5.2" |
| August | 67°F | 89°F | 77°F | 3.7" |
| September | 60°F | 83°F | 70°F | 4.0" |
| October | 48°F | 73°F | 59°F | 3.5" |
| November | 36°F | 63°F | 48°F | 3.8" |
| December | 32°F | 54°F | 42°F | 3.6" |
| Index | Chatham | Virginia | National |
| Air quality index | 26 | 58 | 42 |
| Pollution index | 3,888,220 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 108 |
| Days with good air quality | 107 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.070% |
| Benzene | 0.040% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.040% |
| Mercury | 0.060% |
| City | Population | Air Quality Index | National Avg. |
| Gretna, VA | 1,434 | 26 | 48.0% |
| Mount Hermon, VA | 4,417 | 31 | 38.0% |
| Blairs, VA | 819 | 31 | 38.0% |
| Penhook, VA | 1,347 | 38 | 24.0% |
| Chatham, VA | 1,756 | 26 | 48.0% |
| City | Population | Air Quality Index | National Avg. |
| Golden's Bridge, NY | 1,756 | 43 | 14.0% |
| Elmore, OH | 1,756 | 40 | 20.0% |
| Mont Alto, PA | 1,756 | 36 | 28.0% |
| Parkston, SD | 1,756 | 36 | 28.0% |
| Bay Bulls, NL | 1,756 | n/a | |
| Chatham, VA | 1,756 | 26 | 48.0% |
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