| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 46°F | 36°F | 4.3" |
| February | 27°F | 49°F | 37°F | 4.1" |
| March | 36°F | 59°F | 47°F | 4.8" |
| April | 45°F | 71°F | 57°F | 4.8" |
| May | 53°F | 77°F | 65°F | 8.9" |
| June | 62°F | 85°F | 73°F | 8.5" |
| July | 67°F | 89°F | 77°F | 5.5" |
| August | 65°F | 87°F | 75°F | 4.8" |
| September | 58°F | 80°F | 68°F | 4.8" |
| October | 46°F | 69°F | 57°F | 6.0" |
| November | 36°F | 59°F | 46°F | 4.6" |
| December | 31°F | 50°F | 40°F | 6.5" |
| Index | Stafford Courthouse | Virginia | National |
| Air quality index | 47 | 58 | 42 |
| Pollution index | 658,482 | 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 | 0.010% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.004% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Laurel Hill, VA | 8,771 | 40 | 20.0% |
| Spotsylvania Courthouse, VA | 5,027 | 44 | 12.0% |
| Falmouth, VA | 4,911 | 47 | 6.0% |
| Indian Head, MD | 3,803 | 47 | 6.0% |
| Dumfries, VA | 5,559 | 47 | 6.0% |
| Stafford Courthouse, VA | 4,839 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Cornwallis, MB | 4,840 | n/a | |
| Saint-Mathias-sur-Richelieu, QC | 4,837 | n/a | |
| Stone Park, IL | 4,842 | 55 | 10.0% |
| Luray, VA | 4,842 | 36 | 28.0% |
| Porter, IN | 4,835 | 37 | 26.0% |
| Stafford Courthouse, VA | 4,839 | 47 | 6.0% |
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