| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 46°F | 36°F | 3.6" |
| February | 26°F | 49°F | 37°F | 4.2" |
| March | 36°F | 60°F | 47°F | 4.5" |
| April | 45°F | 71°F | 57°F | 3.3" |
| May | 54°F | 78°F | 65°F | 6.5" |
| June | 63°F | 86°F | 74°F | 6.6" |
| July | 67°F | 89°F | 78°F | 5.7" |
| August | 65°F | 87°F | 75°F | 5.3" |
| September | 58°F | 81°F | 69°F | 6.5" |
| October | 47°F | 71°F | 58°F | 6.2" |
| November | 35°F | 60°F | 46°F | 3.0" |
| December | 30°F | 51°F | 39°F | 4.0" |
| Index | Culpeper | Virginia | National |
| Air quality index | 40 | 58 | 42 |
| Pollution index | 1,198,990 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 282 |
| Days with good air quality | 264 |
| Days with moderate air quality | 18 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Opal, VA | 690 | 38 | 24.0% |
| Sperryville, VA | 291 | 38 | 24.0% |
| Remington, VA | 642 | 38 | 24.0% |
| Bealeton, VA | 3,964 | 38 | 24.0% |
| Lake of the Woods, VA | 8,565 | 40 | 20.0% |
| Culpeper, VA | 18,633 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Cortland, NY | 18,633 | 34 | 32.0% |
| Forest Park, OH | 18,632 | 54 | 8.0% |
| Helena, AL | 18,631 | 53 | 6.0% |
| Imperial, CA | 18,631 | 58 | 16.0% |
| Creve Coeur, MO | 18,627 | 54 | 8.0% |
| Culpeper, VA | 18,633 | 40 | 20.0% |
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