| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 31°F | 21°F | 2.9" |
| February | 15°F | 33°F | 23°F | 2.6" |
| March | 29°F | 49°F | 38°F | 4.2" |
| April | 39°F | 62°F | 50°F | 6.5" |
| May | 51°F | 74°F | 61°F | 6.2" |
| June | 61°F | 82°F | 71°F | 7.9" |
| July | 64°F | 84°F | 73°F | 6.6" |
| August | 61°F | 82°F | 71°F | 9.8" |
| September | 53°F | 76°F | 64°F | 6.2" |
| October | 42°F | 64°F | 52°F | 6.1" |
| November | 30°F | 50°F | 39°F | 4.3" |
| December | 19°F | 34°F | 26°F | 4.0" |
| Index | Fulton | Illinois | National |
| Air quality index | 42 | 41 | 42 |
| Pollution index | 1,753,590 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 268 |
| Days with moderate air quality | 96 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.010% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Goose Lake, IA | 298 | 42 | 16.0% |
| Preston, IA | 1,013 | 42 | 16.0% |
| Thomson, IL | 369 | 42 | 16.0% |
| Morrison, IL | 3,850 | 42 | 16.0% |
| Clinton, IA | 25,290 | 42 | 16.0% |
| Fulton, IL | 3,255 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| El Verano, CA | 3,256 | 35 | 30.0% |
| Attica, IN | 3,256 | 42 | 16.0% |
| Berwyn Heights, MD | 3,256 | 47 | 6.0% |
| Avery Creek, NC | 3,256 | 44 | 12.0% |
| Lewisporte, NL | 3,256 | n/a | |
| Fulton, IL | 3,255 | 42 | 16.0% |
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