| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 33°F | 26°F | 1.4" |
| February | 20°F | 35°F | 27°F | 2.3" |
| March | 31°F | 49°F | 39°F | 4.2" |
| April | 40°F | 62°F | 50°F | 5.9" |
| May | 51°F | 72°F | 61°F | 7.2" |
| June | 60°F | 81°F | 70°F | 5.5" |
| July | 63°F | 83°F | 73°F | 5.5" |
| August | 61°F | 81°F | 71°F | 3.1" |
| September | 55°F | 75°F | 64°F | 4.0" |
| October | 44°F | 63°F | 53°F | 0.3" |
| November | 34°F | 50°F | 41°F | 6.5" |
| December | 25°F | 37°F | 31°F | 2.8" |
| Index | Tri-Lakes | Indiana | National |
| Air quality index | 45 | 56 | 42 |
| Pollution index | 1,165,120 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 236 |
| Days with moderate air quality | 128 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.002% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.100% |
| Mercury | 0.110% |
| City | Population | Air Quality Index | National Avg. |
| Larwill, IN | 294 | 31 | 38.0% |
| South Whitley, IN | 1,512 | 31 | 38.0% |
| Pierceton, IN | 1,145 | 31 | 38.0% |
| Sidney, IN | 64 | 31 | 38.0% |
| Ligonier, IN | 4,489 | 37 | 26.0% |
| Tri-Lakes, IN | 1,531 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Pepeekeo, HI | 1,531 | 16 | 68.0% |
| Elk Rapids, MI | 1,531 | 36 | 28.0% |
| Centerfield, UT | 1,531 | 46 | 8.0% |
| Purdy, WA | 1,531 | 18 | 64.0% |
| Glen Dale, WV | 1,531 | 39 | 22.0% |
| Tri-Lakes, IN | 1,531 | 45 | 10.0% |
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