| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 47°F | 37°F | 2.8" |
| February | 28°F | 50°F | 38°F | 2.0" |
| March | 36°F | 60°F | 47°F | 3.2" |
| April | 45°F | 71°F | 58°F | 3.5" |
| May | 54°F | 78°F | 65°F | 5.1" |
| June | 63°F | 86°F | 74°F | 4.2" |
| July | 67°F | 89°F | 77°F | 3.1" |
| August | 65°F | 87°F | 75°F | 4.0" |
| September | 58°F | 81°F | 69°F | 3.7" |
| October | 47°F | 70°F | 58°F | 4.1" |
| November | 37°F | 60°F | 48°F | 3.0" |
| December | 31°F | 51°F | 40°F | 3.4" |
| Index | Free Union | Virginia | National |
| Air quality index | 40 | 58 | 42 |
| Pollution index | 655,474 | 1,561,881 | 2,726,193 |
| Measurement | Total |
| Days measured | 282 |
| Days with good air quality | 264 |
| Days with moderate air quality | 18 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.020% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Grottoes, VA | 2,797 | 36 | 28.0% |
| Harriston, VA | 910 | 36 | 28.0% |
| Charlottesville, VA | 47,217 | 40 | 20.0% |
| Hollymead, VA | 8,500 | 40 | 20.0% |
| Twin Lakes, VA | 1,522 | 40 | 20.0% |
| Free Union, VA | 86 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Lake City, CA | 86 | 29 | 42.0% |
| Climbing Hill, IA | 86 | 35 | 30.0% |
| Bingham, IL | 86 | 40 | 20.0% |
| Maple City, MI | 86 | 36 | 28.0% |
| Lake Henry, MN | 86 | 32 | 36.0% |
| Free Union, VA | 86 | 40 | 20.0% |
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