| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 45°F | 35°F | 2.7" |
| February | 29°F | 49°F | 38°F | 2.5" |
| March | 38°F | 60°F | 48°F | 4.6" |
| April | 48°F | 72°F | 60°F | 7.3" |
| May | 57°F | 79°F | 68°F | 5.6" |
| June | 66°F | 88°F | 77°F | 4.4" |
| July | 69°F | 90°F | 79°F | 3.7" |
| August | 66°F | 88°F | 76°F | 3.0" |
| September | 58°F | 83°F | 70°F | 4.7" |
| October | 47°F | 73°F | 59°F | 2.2" |
| November | 37°F | 58°F | 47°F | 4.8" |
| December | 31°F | 48°F | 39°F | 3.6" |
| Index | Thebes | Illinois | National |
| Air quality index | 44 | 41 | 42 |
| Pollution index | 2,522,770 | 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 | 0.060% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Olive Branch, IL | 610 | 44 | 12.0% |
| Cairo, IL | 1,884 | 44 | 12.0% |
| Cape Girardeau, MO | 40,100 | 44 | 12.0% |
| Jackson, MO | 14,893 | 44 | 12.0% |
| Lambert, MO | 26 | 44 | 12.0% |
| Thebes, IL | 550 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Eek, AK | 550 | 31 | 38.0% |
| New Cuyama, CA | 550 | 44 | 12.0% |
| San Simeon, CA | 550 | 46 | 8.0% |
| Camargo, IL | 550 | 42 | 16.0% |
| Roanoke, LA | 550 | 45 | 10.0% |
| Thebes, IL | 550 | 44 | 12.0% |
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