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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 30°F | 22°F | 3.8" |
| February | 14°F | 32°F | 23°F | 3.4" |
| March | 29°F | 48°F | 37°F | 4.3" |
| April | 39°F | 62°F | 50°F | 4.5" |
| May | 50°F | 74°F | 61°F | 5.4" |
| June | 59°F | 81°F | 70°F | 6.7" |
| July | 61°F | 82°F | 71°F | 6.0" |
| August | 59°F | 81°F | 69°F | 6.4" |
| September | 51°F | 76°F | 63°F | 3.8" |
| October | 41°F | 63°F | 51°F | 7.1" |
| November | 29°F | 48°F | 38°F | 3.9" |
| December | 19°F | 34°F | 26°F | 3.6" |
| Index | Sublette | Illinois | National |
| Air quality index | 0 | 41 | 42 |
| Pollution index | 2,097,740 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 335 |
| Days with good air quality | 334 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.300% |
| City | Population | Air Quality Index | National Avg. |
| Arlington, IL | 211 | 0 | 100.0% |
| Dover, IL | 141 | 0 | 100.0% |
| Compton, IL | 267 | 0 | 100.0% |
| La Moille, IL | 801 | 0 | 100.0% |
| Mendota, IL | 6,927 | 0 | 100.0% |
| Sublette, IL | 383 | 0 | 100.0% |
| City | Population | Air Quality Index | National Avg. |
| Alpena, AR | 383 | 36 | 28.0% |
| Belgium, IL | 383 | 42 | 16.0% |
| Gentryville, IN | 383 | 6 | 88.0% |
| Kismet, KS | 383 | 15 | 70.0% |
| Fabius, NY | 383 | 37 | 26.0% |
| Sublette, IL | 383 | 0 | 100.0% |
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