| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 31°F | 25°F | 3.5" |
| February | 18°F | 33°F | 25°F | 2.9" |
| March | 29°F | 47°F | 37°F | 4.2" |
| April | 39°F | 60°F | 49°F | 3.4" |
| May | 51°F | 71°F | 60°F | 8.2" |
| June | 60°F | 79°F | 69°F | 6.2" |
| July | 62°F | 82°F | 72°F | 3.9" |
| August | 61°F | 80°F | 70°F | 5.0" |
| September | 54°F | 74°F | 63°F | 2.8" |
| October | 44°F | 62°F | 52°F | 4.9" |
| November | 33°F | 49°F | 40°F | 2.8" |
| December | 24°F | 36°F | 30°F | 2.5" |
| Index | Corunna | Indiana | National |
| Air quality index | 45 | 56 | 42 |
| Pollution index | 2,775,870 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 236 |
| Days with moderate air quality | 128 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.380% |
| Mercury | 0.030% |
| City | Population | Air Quality Index | National Avg. |
| Lagrange, IN | 2,751 | 37 | 26.0% |
| Butler, IN | 2,889 | 45 | 10.0% |
| Kendallville, IN | 9,365 | 45 | 10.0% |
| Churubusco, IN | 1,901 | 45 | 10.0% |
| Avilla, IN | 2,725 | 45 | 10.0% |
| Corunna, IN | 190 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Lutak, AK | 190 | 20 | 60.0% |
| Ruby, AK | 190 | 38 | 24.0% |
| Banks, AR | 190 | 35 | 30.0% |
| Ardencroft, DE | 190 | 51 | 2.0% |
| Harris, IA | 190 | 36 | 28.0% |
| Corunna, IN | 190 | 45 | 10.0% |
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