| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 39°F | 30°F | 2.9" |
| February | 22°F | 40°F | 31°F | 2.3" |
| March | 34°F | 55°F | 44°F | 3.8" |
| April | 44°F | 68°F | 55°F | 5.1" |
| May | 54°F | 77°F | 65°F | 4.6" |
| June | 63°F | 85°F | 73°F | 6.3" |
| July | 64°F | 86°F | 75°F | 4.4" |
| August | 62°F | 85°F | 73°F | 3.0" |
| September | 56°F | 80°F | 67°F | 3.6" |
| October | 45°F | 68°F | 56°F | 3.5" |
| November | 34°F | 55°F | 44°F | 3.5" |
| December | 27°F | 43°F | 34°F | 4.1" |
| Index | Hayden | Indiana | National |
| Air quality index | 35 | 56 | 42 |
| Pollution index | 8,502,260 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 360 |
| Days with good air quality | 340 |
| Days with moderate air quality | 20 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.010% |
| Benzene | 0.080% |
| Carbon Tetrachloride | 0.670% |
| Lead | 0.020% |
| Mercury | 0.010% |
| City | Population | Air Quality Index | National Avg. |
| Country Squire Lakes, IN | 3,220 | 35 | 30.0% |
| Crothersville, IN | 1,771 | 35 | 30.0% |
| Jonesville, IN | 223 | 35 | 30.0% |
| Seymour, IN | 19,780 | 35 | 30.0% |
| Deputy, IN | 34 | 35 | 30.0% |
| Hayden, IN | 542 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Fonda, IA | 542 | 37 | 26.0% |
| Barlow, KY | 542 | 44 | 12.0% |
| Ethel, MS | 542 | 33 | 34.0% |
| Odessa, NY | 542 | 34 | 32.0% |
| Tuxedo Park, NY | 542 | 36 | 28.0% |
| Hayden, IN | 542 | 35 | 30.0% |
Here are the best places to live in Indiana
See the best places to live in Hayden
These are the largest cities in Indiana
Check out the 10 most dangerous cities in Indiana