| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 46°F | 36°F | 6.6" |
| February | 30°F | 49°F | 38°F | 4.5" |
| March | 39°F | 60°F | 48°F | 6.1" |
| April | 47°F | 70°F | 58°F | 6.7" |
| May | 55°F | 76°F | 65°F | 6.9" |
| June | 62°F | 83°F | 72°F | 6.7" |
| July | 65°F | 85°F | 74°F | 7.9" |
| August | 65°F | 84°F | 73°F | 9.1" |
| September | 59°F | 79°F | 68°F | 6.9" |
| October | 48°F | 69°F | 57°F | 7.1" |
| November | 38°F | 59°F | 47°F | 6.1" |
| December | 34°F | 51°F | 41°F | 6.9" |
| Index | Castlewood | Virginia | National |
| Air quality index | 45 | 58 | 42 |
| Pollution index | 68,075 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 236 |
| Days with moderate air quality | 108 |
| Days w/ poor A.Q. for sensitive groups | 21 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Coeburn, VA | 1,472 | 45 | 10.0% |
| Nickelsville, VA | 359 | 45 | 10.0% |
| Dante, VA | 409 | 45 | 10.0% |
| St. Paul, VA | 857 | 45 | 10.0% |
| Dungannon, VA | 302 | 45 | 10.0% |
| Castlewood, VA | 1,315 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Salome, AZ | 1,315 | 13 | 74.0% |
| Redway, CA | 1,315 | 27 | 46.0% |
| Monroeville, IN | 1,315 | 45 | 10.0% |
| Hackberry, LA | 1,315 | 45 | 10.0% |
| Coloma, MI | 1,315 | 39 | 22.0% |
| Castlewood, VA | 1,315 | 45 | 10.0% |
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