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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 38°F | 31°F | 6.8" |
| February | 23°F | 37°F | 29°F | 3.4" |
| March | 35°F | 56°F | 45°F | 3.0" |
| April | 43°F | 65°F | 54°F | 4.2" |
| May | 54°F | 78°F | 66°F | 3.1" |
| June | 64°F | 86°F | 75°F | 8.1" |
| July | 65°F | 86°F | 76°F | 4.0" |
| August | 68°F | 89°F | 78°F | 3.9" |
| September | 59°F | 85°F | 72°F | 7.7" |
| October | 49°F | 71°F | 60°F | 7.1" |
| November | 37°F | 56°F | 45°F | 6.1" |
| December | 24°F | 37°F | 30°F | 2.5" |
| Index | Niantic | Illinois | National |
| Air quality index | 44 | 41 | 42 |
| Pollution index | 5,136,080 | 3,148,694 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 255 |
| Days with moderate air quality | 110 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.090% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.390% |
| Mercury | 0.020% |
| City | Population | Air Quality Index | National Avg. |
| Mechanicsburg, IL | 918 | 40 | 20.0% |
| Broadwell, IL | 188 | 40 | 20.0% |
| Cornland, IL | 71 | 40 | 20.0% |
| Buffalo, IL | 345 | 40 | 20.0% |
| Edinburg, IL | 1,088 | 40 | 20.0% |
| Niantic, IL | 657 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Fairview, AL | 657 | 41 | 18.0% |
| Canton, KS | 657 | 40 | 20.0% |
| Hill City, MN | 657 | 29 | 42.0% |
| Doe Run, MO | 657 | 54 | 8.0% |
| Ramona, OK | 657 | 45 | 10.0% |
| Niantic, IL | 657 | 44 | 12.0% |
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