| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 39°F | 29°F | 2.6" |
| February | 22°F | 41°F | 31°F | 2.0" |
| March | 34°F | 56°F | 44°F | 3.3" |
| April | 44°F | 68°F | 55°F | 5.8" |
| May | 53°F | 76°F | 65°F | 4.3" |
| June | 63°F | 85°F | 73°F | 6.3" |
| July | 64°F | 87°F | 75°F | 4.5" |
| August | 62°F | 86°F | 74°F | 2.3" |
| September | 55°F | 80°F | 67°F | 2.9" |
| October | 44°F | 68°F | 55°F | 3.5" |
| November | 33°F | 55°F | 43°F | 2.7" |
| December | 26°F | 43°F | 34°F | 3.4" |
| Index | Tecumseh | Indiana | National |
| Air quality index | 45 | 56 | 42 |
| Pollution index | 1,601,640 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 237 |
| Days with moderate air quality | 127 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.004% |
| Benzene | 0.030% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.040% |
| Mercury | 0.290% |
| City | Population | Air Quality Index | National Avg. |
| Terre Haute, IN | 60,690 | 45 | 10.0% |
| Vermilion, IL | 289 | 45 | 10.0% |
| Rosedale, IN | 846 | 45 | 10.0% |
| Seelyville, IN | 1,055 | 45 | 10.0% |
| Rockville, IN | 2,304 | 45 | 10.0% |
| Tecumseh, IN | 778 | 45 | 10.0% |
| City | Population | Air Quality Index | National Avg. |
| Oak Creek, CO | 778 | 47 | 6.0% |
| Dover, ID | 778 | 43 | 14.0% |
| Oneida, IL | 778 | 46 | 8.0% |
| Wataga, IL | 778 | 41 | 18.0% |
| Laurel, IN | 778 | 6 | 88.0% |
| Tecumseh, IN | 778 | 45 | 10.0% |
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