| 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 | 42 | 41 | 42 |
| Pollution index | 703,218 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 281 |
| Days with moderate air quality | 84 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Arcola, IL | 2,840 | 42 | 16.0% |
| Tuscola, IL | 4,599 | 42 | 16.0% |
| Pesotum, IL | 447 | 42 | 16.0% |
| Garrett, IL | 118 | 42 | 16.0% |
| Humboldt, IL | 446 | 42 | 16.0% |
| Atwood, IL | 1,126 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Ansonia, OH | 1,126 | 6 | 88.0% |
| Midtown, TN | 1,126 | 53 | 6.0% |
| Winfield, TN | 1,126 | 40 | 20.0% |
| Spring Glen, UT | 1,126 | 46 | 8.0% |
| Division No. 18, Unorganized, SK | 1,126 | n/a | |
| Atwood, IL | 1,126 | 42 | 16.0% |
Here are the best places to live in Illinois
Top 10 best public schools in Atwood
These are the 10 most affordable cities in Illinois
10 Best cities in Illinois for employment