| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 36°F | 29°F | 6.9" |
| February | 19°F | 34°F | 26°F | 3.4" |
| March | 33°F | 54°F | 42°F | 3.3" |
| April | 41°F | 65°F | 52°F | 5.8" |
| May | 52°F | 78°F | 65°F | 3.4" |
| June | 63°F | 85°F | 74°F | 6.1" |
| July | 63°F | 83°F | 73°F | 5.8" |
| August | 65°F | 86°F | 75°F | 5.4" |
| September | 57°F | 83°F | 69°F | 7.0" |
| October | 46°F | 69°F | 57°F | 5.6" |
| November | 33°F | 53°F | 42°F | 7.3" |
| December | 21°F | 35°F | 27°F | 3.7" |
| Index | Atwood | Illinois | National |
| Air quality index | 36 | 41 | 50 |
| Pollution index | 703,218 | 3,347,295 | 5,066,862 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 311 |
| Days with moderate air quality | 54 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City, State | Population | Air Quality Index | National Avg. |
| Tolono, IL | 3,101 | 36 | 28% |
| Arcola, IL | 2,881 | 36 | 28% |
| Humboldt, IL | 483 | 36 | 28% |
| Pesotum, IL | 514 | 36 | 28% |
| Tuscola, IL | 4,478 | 36 | 28% |
| Atwood, IL | 1,106 | 36 | 28% |
| City, State | Population | Air Quality Index | National Avg. |
| Alexandria, TN | 1,106 | 33 | 34% |
| Simpson, PA | 1,106 | 40 | 20% |
| Kempner, TX | 1,105 | 36 | 28% |
| Bally, PA | 1,107 | 47 | 6% |
| Houck, AZ | 1,107 | 17 | 66% |
| Atwood, IL | 1,106 | 36 | 28% |
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