| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 33°F | 48°F | 40°F | 5.9" |
| February | 33°F | 50°F | 41°F | 3.9" |
| March | 40°F | 58°F | 48°F | 8.0" |
| April | 49°F | 68°F | 58°F | 4.6" |
| May | 58°F | 76°F | 66°F | 11.8" |
| June | 67°F | 84°F | 75°F | 6.6" |
| July | 72°F | 88°F | 79°F | 7.6" |
| August | 69°F | 86°F | 77°F | 7.9" |
| September | 64°F | 80°F | 71°F | 9.6" |
| October | 53°F | 72°F | 62°F | 8.0" |
| November | 43°F | 60°F | 51°F | 3.5" |
| December | 37°F | 53°F | 45°F | 7.3" |
| Index | Keller | Virginia | National |
| Air quality index | 40 | 58 | 42 |
| Pollution index | 2,109,850 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 317 |
| Days with moderate air quality | 48 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.003% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Modest Town, VA | 224 | 36 | 28.0% |
| Quinby, VA | 309 | 40 | 20.0% |
| Wachapreague, VA | 211 | 40 | 20.0% |
| Exmore, VA | 1,500 | 40 | 20.0% |
| Mappsburg, VA | 94 | 40 | 20.0% |
| Keller, VA | 287 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Bowles, CA | 287 | 60 | 20.0% |
| Iroquois, IL | 287 | 42 | 16.0% |
| Mentor, KY | 287 | 54 | 8.0% |
| Parsonsburg, MD | 287 | 36 | 28.0% |
| Pecktonville, MD | 287 | 40 | 20.0% |
| Keller, VA | 287 | 40 | 20.0% |
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