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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 38°F | 31°F | 6.8" |
| February | 23°F | 37°F | 29°F | 3.4" |
| March | 35°F | 56°F | 45°F | 3.0" |
| April | 43°F | 65°F | 54°F | 4.2" |
| May | 54°F | 78°F | 66°F | 3.1" |
| June | 64°F | 86°F | 75°F | 8.1" |
| July | 65°F | 86°F | 76°F | 4.0" |
| August | 68°F | 89°F | 78°F | 3.9" |
| September | 59°F | 85°F | 72°F | 7.7" |
| October | 49°F | 71°F | 60°F | 7.1" |
| November | 37°F | 56°F | 45°F | 6.1" |
| December | 24°F | 37°F | 30°F | 2.5" |
| Index | Bethany | Illinois | National |
| Air quality index | 44 | 41 | 42 |
| Pollution index | 703,218 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 255 |
| Days with moderate air quality | 110 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| 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. |
| Windsor village, IL | 965 | 40 | 20.0% |
| Windsor, IL | 1,150 | 40 | 20.0% |
| Gays, IL | 209 | 40 | 20.0% |
| Atwood, IL | 1,126 | 42 | 16.0% |
| Dalton City, IL | 717 | 44 | 12.0% |
| Bethany, IL | 1,311 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| St. Michaels, MD | 1,311 | 41 | 18.0% |
| Burgettstown, PA | 1,311 | 46 | 8.0% |
| Loganville, PA | 1,311 | 41 | 18.0% |
| West Easton, PA | 1,311 | 42 | 16.0% |
| Upham, NB | 1,311 | n/a | |
| Bethany, IL | 1,311 | 44 | 12.0% |
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