| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 45°F | 34°F | 3.8" |
| February | 26°F | 48°F | 36°F | 3.1" |
| March | 36°F | 60°F | 48°F | 4.7" |
| April | 45°F | 72°F | 59°F | 5.9" |
| May | 55°F | 79°F | 67°F | 4.9" |
| June | 64°F | 88°F | 76°F | 4.3" |
| July | 67°F | 90°F | 78°F | 5.2" |
| August | 66°F | 90°F | 77°F | 3.2" |
| September | 58°F | 84°F | 70°F | 4.2" |
| October | 46°F | 73°F | 59°F | 3.9" |
| November | 35°F | 60°F | 47°F | 4.1" |
| December | 29°F | 48°F | 38°F | 4.8" |
| Index | Poseyville | Indiana | National |
| Air quality index | 45 | 56 | 42 |
| Pollution index | 317,387 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 244 |
| Days with moderate air quality | 111 |
| Days w/ poor A.Q. for sensitive groups | 10 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Keensburg, IL | 111 | 36 | 28.0% |
| Albion, IL | 2,215 | 36 | 28.0% |
| Princeton, IN | 8,716 | 36 | 28.0% |
| Bellmont, IL | 238 | 36 | 28.0% |
| Browns, IL | 226 | 36 | 28.0% |
| Poseyville, IN | 1,010 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Chalfant, CA | 1,010 | 47 | 6.0% |
| Flovilla, GA | 1,010 | 38 | 24.0% |
| Rapids City, IL | 1,010 | 46 | 8.0% |
| Grant City, MO | 1,010 | 43 | 14.0% |
| Linton, ND | 1,010 | 36 | 28.0% |
| Poseyville, IN | 1,010 | 45 | 10.0% |
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