| 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 | Westville | Indiana | National |
| Air quality index | 37 | 56 | 42 |
| Pollution index | 898,555 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 305 |
| Days with moderate air quality | 55 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| 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. |
| La Porte, IN | 21,328 | 37 | 26.0% |
| Aberdeen, IN | 1,698 | 37 | 26.0% |
| Portage, IN | 36,524 | 37 | 26.0% |
| Valparaiso, IN | 33,707 | 37 | 26.0% |
| Porter, IN | 4,835 | 37 | 26.0% |
| Westville, IN | 5,822 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Pontoon Beach, IL | 5,822 | 54 | 8.0% |
| Smiths Station, AL | 5,821 | 42 | 16.0% |
| Rupert, ID | 5,820 | 20 | 60.0% |
| Lakemoor, IL | 5,820 | 39 | 22.0% |
| Massanetta Springs, VA | 5,819 | 36 | 28.0% |
| Westville, IN | 5,822 | 37 | 26.0% |
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