| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 26°F | 3.3" |
| February | 19°F | 35°F | 26°F | 3.0" |
| March | 32°F | 51°F | 40°F | 4.3" |
| April | 42°F | 64°F | 52°F | 7.2" |
| May | 53°F | 75°F | 63°F | 8.0" |
| June | 62°F | 83°F | 72°F | 7.5" |
| July | 66°F | 85°F | 75°F | 7.1" |
| August | 64°F | 83°F | 73°F | 8.2" |
| September | 56°F | 78°F | 66°F | 6.3" |
| October | 45°F | 65°F | 54°F | 6.6" |
| November | 34°F | 51°F | 42°F | 4.3" |
| December | 23°F | 37°F | 30°F | 3.5" |
| Index | Earlville | Illinois | National |
| Air quality index | 0 | 41 | 42 |
| Pollution index | 1,874,490 | 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 | 0.002% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.010% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Troy Grove, IL | 210 | 0 | 100.0% |
| Mendota, IL | 6,927 | 0 | 100.0% |
| Hinckley, IL | 2,190 | 0 | 100.0% |
| Somonauk, IL | 2,027 | 0 | 100.0% |
| Cherry, IL | 479 | 0 | 100.0% |
| Earlville, IL | 2,057 | 0 | 100.0% |
| City | Population | Air Quality Index | National Avg. |
| Byron, CA | 2,057 | 45 | 10.0% |
| Calabash, NC | 2,057 | 34 | 32.0% |
| McCleary, WA | 2,057 | 21 | 58.0% |
| Fogo Island, NL | 2,057 | n/a | |
| Shannon, GA | 2,056 | 44 | 12.0% |
| Earlville, IL | 2,057 | 0 | 100.0% |
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