| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 34°F | 27°F | 5.8" |
| February | 18°F | 31°F | 24°F | 3.3" |
| March | 30°F | 49°F | 38°F | 2.1" |
| April | 39°F | 61°F | 49°F | 4.0" |
| May | 49°F | 73°F | 60°F | 2.8" |
| June | 62°F | 83°F | 72°F | 5.0" |
| July | 62°F | 84°F | 73°F | 4.8" |
| August | 64°F | 82°F | 73°F | 10.7" |
| September | 56°F | 80°F | 67°F | 5.3" |
| October | 48°F | 67°F | 57°F | 3.6" |
| November | 34°F | 51°F | 41°F | 2.9" |
| December | 21°F | 33°F | 27°F | 2.0" |
| Index | Rensselaer | Indiana | National |
| Air quality index | 42 | 56 | 42 |
| Pollution index | 898,555 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 276 |
| Days with moderate air quality | 89 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lake Village, IN | 707 | 37 | 26.0% |
| Medaryville, IN | 712 | 37 | 26.0% |
| Roselawn, IN | 3,519 | 37 | 26.0% |
| Wolcott, IN | 1,244 | 42 | 16.0% |
| Morocco, IN | 1,097 | 42 | 16.0% |
| Rensselaer, IN | 6,151 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Naples Park, FL | 6,151 | 34 | 32.0% |
| Holly, MI | 6,151 | 38 | 24.0% |
| East End, AR | 6,150 | 45 | 10.0% |
| Latimer, MS | 6,148 | 42 | 16.0% |
| Silver Lake, NC | 6,146 | 34 | 32.0% |
| Rensselaer, IN | 6,151 | 42 | 16.0% |
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