| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 48°F | 35°F | 3.9" |
| February | 27°F | 50°F | 38°F | 3.2" |
| March | 32°F | 58°F | 44°F | 4.5" |
| April | 43°F | 72°F | 57°F | 4.9" |
| May | 53°F | 78°F | 65°F | 5.7" |
| June | 63°F | 86°F | 74°F | 9.2" |
| July | 66°F | 89°F | 77°F | 7.1" |
| August | 63°F | 87°F | 74°F | 3.5" |
| September | 57°F | 83°F | 69°F | 4.7" |
| October | 45°F | 72°F | 58°F | 6.1" |
| November | 34°F | 61°F | 46°F | 5.2" |
| December | 29°F | 52°F | 40°F | 4.1" |
| Index | Catlett | Virginia | National |
| Air quality index | 47 | 58 | 42 |
| Pollution index | 1,198,990 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 209 |
| Days with moderate air quality | 145 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 1 |
| 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% |
| Marshall, VA | 2,913 | 38 | 24.0% |
| Opal, VA | 690 | 38 | 24.0% |
| New Baltimore, VA | 11,017 | 38 | 24.0% |
| Catlett, VA | 54 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Perryville, AK | 54 | 31 | 38.0% |
| Rampart, AK | 54 | 38 | 24.0% |
| Putnam, AL | 54 | 36 | 28.0% |
| Copper Hill, AZ | 54 | 60 | 20.0% |
| Fellows, CA | 54 | 67 | 34.0% |
| Catlett, VA | 54 | 47 | 6.0% |
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