| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 25°F | 42°F | 33°F | 14.9" |
| February | 26°F | 44°F | 35°F | 3.8" |
| March | 38°F | 58°F | 47°F | 7.3" |
| April | 47°F | 69°F | 57°F | 10.6" |
| May | 56°F | 77°F | 66°F | 7.1" |
| June | 64°F | 86°F | 75°F | 8.0" |
| July | 67°F | 87°F | 76°F | 7.6" |
| August | 65°F | 87°F | 75°F | 4.2" |
| September | 59°F | 81°F | 69°F | 8.1" |
| October | 47°F | 69°F | 57°F | 8.2" |
| November | 37°F | 57°F | 46°F | 6.5" |
| December | 30°F | 46°F | 37°F | 8.2" |
| Index | Tennyson | Indiana | National |
| Air quality index | 43 | 56 | 42 |
| Pollution index | 4,793,970 | 2,719,453 | 2,726,193 |
| Measurement | Total |
| Days measured | 364 |
| Days with good air quality | 276 |
| Days with moderate air quality | 87 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.310% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.120% |
| Mercury | 0.140% |
| City | Population | Air Quality Index | National Avg. |
| Dale, IN | 1,442 | 6 | 88.0% |
| Santa Claus, IN | 2,495 | 6 | 88.0% |
| Ferdinand, IN | 2,133 | 6 | 88.0% |
| Gentryville, IN | 383 | 6 | 88.0% |
| Spurgeon, IN | 123 | 6 | 88.0% |
| Tennyson, IN | 230 | 43 | 14.0% |
| City | Population | Air Quality Index | National Avg. |
| Nelchina, AK | 230 | 31 | 38.0% |
| Friendship, AR | 230 | 32 | 36.0% |
| Riggins, ID | 230 | 29 | 42.0% |
| Coleta, IL | 230 | 42 | 16.0% |
| South Carrollton, KY | 230 | 43 | 14.0% |
| Tennyson, IN | 230 | 43 | 14.0% |
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