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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 44°F | 34°F | 2.3" |
| February | 27°F | 46°F | 36°F | 2.5" |
| March | 38°F | 60°F | 48°F | 4.8" |
| April | 47°F | 70°F | 58°F | 6.2" |
| May | 56°F | 78°F | 67°F | 4.9" |
| June | 66°F | 88°F | 76°F | 4.1" |
| July | 68°F | 89°F | 78°F | 5.0" |
| August | 66°F | 88°F | 76°F | 3.5" |
| September | 57°F | 81°F | 68°F | 3.4" |
| October | 46°F | 71°F | 58°F | 3.6" |
| November | 36°F | 58°F | 46°F | 3.7" |
| December | 30°F | 47°F | 38°F | 3.7" |
| Index | Elkville | Illinois | National |
| Air quality index | 43 | 41 | 42 |
| Pollution index | 569,178 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 344 |
| Days with good air quality | 269 |
| Days with moderate air quality | 74 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Christopher, IL | 2,601 | 43 | 14.0% |
| Royalton, IL | 1,107 | 43 | 14.0% |
| Carbondale, IL | 25,400 | 43 | 14.0% |
| Gorham, IL | 263 | 43 | 14.0% |
| Freeman Spur, IL | 269 | 43 | 14.0% |
| Elkville, IL | 796 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Allgood, AL | 796 | 43 | 14.0% |
| Fouke, AR | 796 | 39 | 22.0% |
| Gilbertville, IA | 796 | 39 | 22.0% |
| Gobles, MI | 796 | 39 | 22.0% |
| Landfall, MN | 796 | 46 | 8.0% |
| Elkville, IL | 796 | 43 | 14.0% |
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