| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 27°F | 45°F | 35°F | 3.7" |
| February | 29°F | 47°F | 37°F | 2.9" |
| March | 39°F | 60°F | 48°F | 4.5" |
| April | 48°F | 71°F | 59°F | 6.3" |
| May | 57°F | 79°F | 68°F | 5.7" |
| June | 66°F | 87°F | 77°F | 5.3" |
| July | 69°F | 89°F | 79°F | 5.6" |
| August | 68°F | 89°F | 78°F | 3.7" |
| September | 61°F | 83°F | 71°F | 4.6" |
| October | 48°F | 71°F | 59°F | 4.4" |
| November | 38°F | 59°F | 48°F | 3.5" |
| December | 31°F | 48°F | 39°F | 4.8" |
| Index | Hanover | 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. |
| Madison, IN | 12,030 | 35 | 30.0% |
| Canaan, IN | 72 | 35 | 30.0% |
| Deputy, IN | 35 | 35 | 30.0% |
| Milton, KY | 629 | 35 | 30.0% |
| Dupont, IN | 329 | 35 | 30.0% |
| Hanover, IN | 3,523 | 35 | 30.0% |
| City | Population | Air Quality Index | National Avg. |
| Mayfield, OH | 3,523 | 50 | = 100 |
| Bullard, TX | 3,522 | 36 | 28.0% |
| Piney Point Village, TX | 3,522 | 52 | 4.0% |
| Haworth, NJ | 3,521 | 51 | 2.0% |
| Barrett, TX | 3,521 | 52 | 4.0% |
| Hanover, IN | 3,523 | 35 | 30.0% |
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