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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 33°F | 25°F | 2.9" |
| February | 17°F | 32°F | 24°F | 2.5" |
| March | 31°F | 52°F | 39°F | 4.5" |
| April | 39°F | 65°F | 50°F | 6.4" |
| May | 50°F | 76°F | 62°F | 3.5" |
| June | 61°F | 86°F | 73°F | 6.1" |
| July | 61°F | 86°F | 73°F | 7.8" |
| August | 64°F | 85°F | 73°F | 9.2" |
| September | 55°F | 82°F | 67°F | 3.9" |
| October | 45°F | 69°F | 56°F | 1.9" |
| November | 30°F | 52°F | 40°F | 4.2" |
| December | 17°F | 31°F | 23°F | 1.5" |
| Index | Sheffield | Illinois | National |
| Air quality index | 41 | 41 | 42 |
| Pollution index | 339,156 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 285 |
| Days with moderate air quality | 78 |
| Days w/ poor A.Q. for sensitive groups | 2 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Princeton, IL | 7,860 | 0 | 100.0% |
| Ohio, IL | 520 | 0 | 100.0% |
| Wyanet, IL | 1,265 | 0 | 100.0% |
| Tiskilwa, IL | 710 | 0 | 100.0% |
| Kewanee, IL | 12,961 | 41 | 18.0% |
| Sheffield, IL | 852 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Edgewater, AL | 852 | 53 | 6.0% |
| Patagonia, AZ | 852 | 31 | 38.0% |
| Rhine, GA | 852 | 26 | 48.0% |
| Coldwater, KS | 852 | 15 | 70.0% |
| Lamberton, MN | 852 | 32 | 36.0% |
| Sheffield, IL | 852 | 41 | 18.0% |
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