| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 46°F | 34°F | 2.7" |
| February | 25°F | 48°F | 36°F | 2.1" |
| March | 33°F | 58°F | 45°F | 3.2" |
| April | 43°F | 71°F | 56°F | 3.7" |
| May | 52°F | 78°F | 65°F | 5.6" |
| June | 61°F | 86°F | 74°F | 4.5" |
| July | 66°F | 90°F | 78°F | 4.2" |
| August | 65°F | 88°F | 76°F | 2.8" |
| September | 58°F | 82°F | 69°F | 3.5" |
| October | 46°F | 71°F | 58°F | 5.4" |
| November | 35°F | 59°F | 46°F | 2.6" |
| December | 29°F | 50°F | 39°F | 3.8" |
| Index | Hamilton | Virginia | National |
| Air quality index | 38 | 58 | 42 |
| Pollution index | 205,216 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 333 |
| Days with moderate air quality | 32 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Woodburn, VA | 10,081 | 38 | 24.0% |
| Purcellville, VA | 10,063 | 38 | 24.0% |
| Ranson, WV | 5,217 | 38 | 24.0% |
| Round Hill, VA | 695 | 38 | 24.0% |
| Shannondale, WV | 3,364 | 38 | 24.0% |
| Hamilton, VA | 708 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Huttig, AR | 708 | 35 | 30.0% |
| Ducor, CA | 708 | 66 | 32.0% |
| Shelby, IA | 708 | 40 | 20.0% |
| Sharpsburg, MD | 708 | 40 | 20.0% |
| Hardwood Acres, MI | 708 | 36 | 28.0% |
| Hamilton, VA | 708 | 38 | 24.0% |
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