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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 7°F | 28°F | 17°F | 0.4" |
| February | 9°F | 31°F | 19°F | 0.8" |
| March | 23°F | 47°F | 33°F | 0.9" |
| April | 33°F | 60°F | 45°F | 1.9" |
| May | 44°F | 71°F | 57°F | 3.3" |
| June | 55°F | 81°F | 67°F | 3.1" |
| July | 61°F | 89°F | 74°F | 2.0" |
| August | 59°F | 86°F | 71°F | 3.0" |
| September | 50°F | 77°F | 62°F | 1.6" |
| October | 37°F | 61°F | 48°F | 1.8" |
| November | 23°F | 46°F | 33°F | 0.4" |
| December | 10°F | 29°F | 19°F | 0.7" |
| Index | Seneca | South Dakota | National |
| Air quality index | 20 | 36 | 42 |
| Pollution index | 120,529 | 345,623 | 2,726,193 |
| Measurement | Total |
| Days measured | 122 |
| Days with good air quality | 112 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Tolstoy, SD | 34 | 20 | 60.0% |
| Hoven, SD | 313 | 20 | 60.0% |
| Lebanon, SD | 48 | 20 | 60.0% |
| Onaka, SD | 28 | 20 | 60.0% |
| Seneca, SD | 39 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Stony River, AK | 39 | 31 | 38.0% |
| Sunrise, AK | 39 | 31 | 38.0% |
| Tibbie, AL | 39 | 42 | 16.0% |
| Haigler Creek, AZ | 39 | 60 | 20.0% |
| Edgewood, CA | 39 | 42 | 16.0% |
| Seneca, SD | 39 | 20 | 60.0% |
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