| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 31°F | 50°F | 40°F | 5.0" |
| February | 31°F | 53°F | 41°F | 4.2" |
| March | 39°F | 62°F | 50°F | 4.8" |
| April | 48°F | 73°F | 60°F | 7.0" |
| May | 57°F | 79°F | 68°F | 6.3" |
| June | 66°F | 87°F | 76°F | 9.1" |
| July | 71°F | 90°F | 80°F | 7.8" |
| August | 69°F | 88°F | 78°F | 6.0" |
| September | 63°F | 82°F | 72°F | 8.9" |
| October | 51°F | 73°F | 61°F | 8.0" |
| November | 39°F | 62°F | 50°F | 4.0" |
| December | 34°F | 55°F | 44°F | 5.0" |
| Index | Gwynn | Virginia | National |
| Air quality index | 40 | 58 | 42 |
| Pollution index | 244,779 | 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 | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Mathews, VA | 683 | 40 | 20.0% |
| Gloucester Courthouse, VA | 2,969 | 40 | 20.0% |
| Deltaville, VA | 943 | 40 | 20.0% |
| Chase Crossing, VA | 357 | 41 | 18.0% |
| Kilmarnock, VA | 1,488 | 41 | 18.0% |
| Gwynn, VA | 634 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Fuller Acres, CA | 634 | 67 | 34.0% |
| Vernon, FL | 634 | 38 | 24.0% |
| Toomsboro, GA | 634 | 38 | 24.0% |
| Doon, IA | 634 | 36 | 28.0% |
| Ririe, ID | 634 | 43 | 14.0% |
| Gwynn, VA | 634 | 40 | 20.0% |
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