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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 28°F | 46°F | 36°F | 5.4" |
| February | 30°F | 48°F | 38°F | 3.9" |
| March | 40°F | 60°F | 49°F | 7.8" |
| April | 49°F | 72°F | 60°F | 8.6" |
| May | 58°F | 79°F | 67°F | 6.3" |
| June | 67°F | 88°F | 77°F | 6.6" |
| July | 69°F | 88°F | 78°F | 6.4" |
| August | 67°F | 88°F | 77°F | 6.0" |
| September | 59°F | 82°F | 70°F | 5.5" |
| October | 48°F | 72°F | 59°F | 5.5" |
| November | 38°F | 59°F | 47°F | 5.8" |
| December | 32°F | 48°F | 39°F | 6.3" |
| Index | Vienna | Illinois | National |
| Air quality index | 44 | 41 | 42 |
| Pollution index | 125,359 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 261 |
| Days with moderate air quality | 103 |
| 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 | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Belknap, IL | 142 | 44 | 12.0% |
| Karnak, IL | 473 | 44 | 12.0% |
| Joppa, IL | 263 | 44 | 12.0% |
| Buncombe, IL | 283 | 44 | 12.0% |
| New Grand Chain, IL | 172 | 44 | 12.0% |
| Vienna, IL | 1,587 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Gasport, NY | 1,587 | 39 | 22.0% |
| Saint-Jean-de-Dieu, QC | 1,587 | n/a | |
| Mulberry, AR | 1,586 | 36 | 28.0% |
| Rehoboth Beach, DE | 1,588 | 36 | 28.0% |
| Dimondale, MI | 1,588 | 36 | 28.0% |
| Vienna, IL | 1,587 | 44 | 12.0% |
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