| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 14°F | 30°F | 22°F | 3.8" |
| February | 14°F | 32°F | 23°F | 3.4" |
| March | 29°F | 48°F | 37°F | 4.3" |
| April | 39°F | 62°F | 50°F | 4.5" |
| May | 50°F | 74°F | 61°F | 5.4" |
| June | 59°F | 81°F | 70°F | 6.7" |
| July | 61°F | 82°F | 71°F | 6.0" |
| August | 59°F | 81°F | 69°F | 6.4" |
| September | 51°F | 76°F | 63°F | 3.8" |
| October | 41°F | 63°F | 51°F | 7.1" |
| November | 29°F | 48°F | 38°F | 3.9" |
| December | 19°F | 34°F | 26°F | 3.6" |
| Index | Lost Nation | Illinois | National |
| Air quality index | 42 | 41 | 42 |
| Pollution index | 2,097,740 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 341 |
| Days with good air quality | 240 |
| Days with moderate air quality | 100 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.060% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.001% |
| Mercury | 0.300% |
| City | Population | Air Quality Index | National Avg. |
| Amboy, IL | 2,453 | 0 | 100.0% |
| Forreston, IL | 1,392 | 42 | 16.0% |
| Dixon, IL | 15,544 | 42 | 16.0% |
| Nelson, IL | 132 | 42 | 16.0% |
| Ashton, IL | 827 | 42 | 16.0% |
| Lost Nation, IL | 570 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| New Stuyahok, AK | 570 | 31 | 38.0% |
| Our Town, AL | 570 | 52 | 4.0% |
| Alford, FL | 570 | 35 | 30.0% |
| Charter Oak, IA | 570 | 35 | 30.0% |
| Roberts, ID | 570 | 27 | 46.0% |
| Lost Nation, IL | 570 | 42 | 16.0% |
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