| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 37°F | 29°F | 8.1" |
| February | 18°F | 34°F | 26°F | 4.1" |
| March | 32°F | 52°F | 41°F | 5.7" |
| April | 40°F | 64°F | 51°F | 7.1" |
| May | 51°F | 75°F | 63°F | 2.9" |
| June | 62°F | 84°F | 73°F | 4.0" |
| July | 61°F | 84°F | 72°F | 4.9" |
| August | 64°F | 85°F | 74°F | 8.8" |
| September | 57°F | 81°F | 68°F | 4.3" |
| October | 49°F | 68°F | 58°F | 5.4" |
| November | 34°F | 53°F | 43°F | 6.2" |
| December | 22°F | 36°F | 29°F | 5.0" |
| Index | Dunkirk | Indiana | National |
| Air quality index | 35 | 56 | 42 |
| Pollution index | 508,399 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 352 |
| Days with good air quality | 319 |
| Days with moderate air quality | 33 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Pennville, IN | 866 | 35 | 30.0% |
| Selma, IN | 979 | 35 | 30.0% |
| Eaton, IN | 1,959 | 35 | 30.0% |
| Bryant, IN | 214 | 35 | 30.0% |
| Portland, IN | 5,972 | 35 | 30.0% |
| Dunkirk, IN | 1,923 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Plantsville, CT | 1,923 | 41 | 18.0% |
| Manitou Beach-Devils Lake, MI | 1,923 | 39 | 22.0% |
| Lepanto, AR | 1,922 | 45 | 10.0% |
| Los Molinos, CA | 1,924 | 41 | 18.0% |
| Laurium, MI | 1,922 | 8 | 84.0% |
| Dunkirk, IN | 1,923 | 35 | 30.0% |
Here are the best places to live in Indiana
See the best places to live in Dunkirk
Most Dangerous States In The US
These are the 10 cheapest cities in Indiana