| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 43°F | 33°F | 4.8" |
| February | 29°F | 50°F | 39°F | 2.7" |
| March | 38°F | 61°F | 49°F | 3.7" |
| April | 45°F | 72°F | 57°F | 2.2" |
| May | 56°F | 78°F | 66°F | 9.6" |
| June | 63°F | 86°F | 74°F | 3.7" |
| July | 67°F | 91°F | 78°F | 7.3" |
| August | 65°F | 88°F | 76°F | 3.9" |
| September | 57°F | 81°F | 68°F | 6.9" |
| October | 45°F | 69°F | 56°F | 8.0" |
| November | 36°F | 59°F | 46°F | 5.1" |
| December | 30°F | 50°F | 39°F | 3.8" |
| Index | Opal | Virginia | National |
| Air quality index | 38 | 58 | 42 |
| Pollution index | 1,198,990 | 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 | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.002% |
| City | Population | Air Quality Index | National Avg. |
| Warrenton, VA | 9,928 | 38 | 24.0% |
| Bealeton, VA | 3,964 | 38 | 24.0% |
| Remington, VA | 642 | 38 | 24.0% |
| New Baltimore, VA | 11,017 | 38 | 24.0% |
| Culpeper, VA | 18,633 | 40 | 20.0% |
| Opal, VA | 690 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| McRae, AR | 690 | 45 | 10.0% |
| Willow Valley, AZ | 690 | 13 | 74.0% |
| Wabasso, FL | 690 | 36 | 28.0% |
| Avon, IL | 690 | 41 | 18.0% |
| Beverly Shores, IN | 690 | 37 | 26.0% |
| Opal, VA | 690 | 38 | 24.0% |
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