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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 34°F | 26°F | 4.5" |
| February | 19°F | 35°F | 27°F | 3.6" |
| March | 31°F | 49°F | 39°F | 4.4" |
| April | 40°F | 62°F | 50°F | 5.4" |
| May | 50°F | 72°F | 60°F | 6.5" |
| June | 60°F | 81°F | 70°F | 5.8" |
| July | 64°F | 84°F | 74°F | 8.0" |
| August | 63°F | 82°F | 72°F | 7.5" |
| September | 56°F | 76°F | 65°F | 5.4" |
| October | 45°F | 64°F | 54°F | 6.2" |
| November | 33°F | 51°F | 42°F | 5.4" |
| December | 24°F | 38°F | 31°F | 3.8" |
| Index | Lake Dalecarlia | Indiana | National |
| Air quality index | 37 | 56 | 42 |
| Pollution index | 3,962,360 | 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 | 0.002% |
| Benzene | 0.070% |
| Carbon Tetrachloride | 0.020% |
| Lead | 0.300% |
| Mercury | 0.110% |
| City | Population | Air Quality Index | National Avg. |
| Merrillville, IN | 34,871 | 37 | 26.0% |
| De Motte, IN | 4,093 | 37 | 26.0% |
| Hobart, IN | 28,120 | 37 | 26.0% |
| South Haven, IN | 5,017 | 37 | 26.0% |
| Lake Village, IN | 707 | 37 | 26.0% |
| Lake Dalecarlia, IN | 1,779 | 37 | 26.0% |
| City | Population | Air Quality Index | National Avg. |
| Delaware City, DE | 1,779 | 42 | 16.0% |
| Zeigler, IL | 1,779 | 43 | 14.0% |
| Long Lake, MN | 1,779 | 46 | 8.0% |
| Oologah, OK | 1,779 | 45 | 10.0% |
| Warfield, BC | 1,779 | n/a | |
| Lake Dalecarlia, IN | 1,779 | 37 | 26.0% |