| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 29°F | 49°F | 38°F | 3.9" |
| February | 30°F | 51°F | 39°F | 3.3" |
| March | 38°F | 61°F | 49°F | 4.0" |
| April | 48°F | 72°F | 59°F | 5.4" |
| May | 57°F | 79°F | 67°F | 7.3" |
| June | 66°F | 87°F | 75°F | 4.4" |
| July | 70°F | 91°F | 79°F | 6.3" |
| August | 68°F | 88°F | 77°F | 6.0" |
| September | 61°F | 82°F | 71°F | 4.8" |
| October | 50°F | 72°F | 60°F | 5.4" |
| November | 38°F | 61°F | 49°F | 3.9" |
| December | 33°F | 53°F | 42°F | 4.5" |
| Index | Falmouth | 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. |
| Lake Wilderness, VA | 2,837 | 40 | 20.0% |
| Laurel Hill, VA | 8,771 | 40 | 20.0% |
| Long Branch, VA | 7,906 | 44 | 12.0% |
| Port Royal, VA | 151 | 44 | 12.0% |
| Spotsylvania Courthouse, VA | 5,027 | 44 | 12.0% |
| Falmouth, VA | 4,911 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Demarest, NJ | 4,911 | 51 | 2.0% |
| Northvale, NJ | 4,911 | 51 | 2.0% |
| Pascoag, RI | 4,911 | 44 | 12.0% |
| Eagar, AZ | 4,910 | 44 | 12.0% |
| Silver Springs, NV | 4,910 | 39 | 22.0% |
| Falmouth, VA | 4,911 | 47 | 6.0% |
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