| 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 | Columbia | Virginia | National |
| Air quality index | 40 | 58 | 42 |
| Pollution index | 532,332 | 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 | 0.030% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Rivanna, VA | 1,864 | 40 | 20.0% |
| Lake Monticello, VA | 10,457 | 40 | 20.0% |
| Palmyra, VA | 92 | 40 | 20.0% |
| Goochland, VA | 679 | 44 | 12.0% |
| Powhatan, VA | 416 | 44 | 12.0% |
| Columbia, VA | 102 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| St. George, AK | 102 | 31 | 38.0% |
| Kingvale, CA | 102 | 44 | 12.0% |
| Mount Laguna, CA | 102 | 64 | 28.0% |
| Phillipsville, CA | 102 | 27 | 46.0% |
| Hull, GA | 102 | 44 | 12.0% |
| Columbia, VA | 102 | 40 | 20.0% |
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