| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 8°F | 25°F | 16°F | 0.4" |
| February | 11°F | 29°F | 19°F | 0.7" |
| March | 24°F | 42°F | 32°F | 1.7" |
| April | 35°F | 57°F | 45°F | 2.7" |
| May | 46°F | 70°F | 57°F | 4.4" |
| June | 57°F | 79°F | 67°F | 6.6" |
| July | 62°F | 84°F | 73°F | 6.9" |
| August | 59°F | 80°F | 69°F | 7.0" |
| September | 50°F | 73°F | 61°F | 8.2" |
| October | 38°F | 59°F | 47°F | 5.0" |
| November | 25°F | 46°F | 34°F | 1.5" |
| December | 11°F | 28°F | 18°F | 1.6" |
| Index | Estelline | South Dakota | National |
| Air quality index | 42 | 36 | 42 |
| Pollution index | 256,092 | 345,623 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 284 |
| Days with moderate air quality | 76 |
| Days w/ poor A.Q. for sensitive groups | 5 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Lake Poinsett, SD | 480 | 25 | 50.0% |
| Clear Lake, SD | 1,503 | 25 | 50.0% |
| Castlewood, SD | 582 | 25 | 50.0% |
| Hayti, SD | 391 | 25 | 50.0% |
| Toronto, SD | 267 | 42 | 16.0% |
| Estelline, SD | 858 | 42 | 16.0% |
| City | Population | Air Quality Index | National Avg. |
| Sedan, KS | 858 | 40 | 20.0% |
| East Bernstadt, KY | 858 | 40 | 20.0% |
| Griggstown, NJ | 858 | 41 | 18.0% |
| Butler, OH | 858 | 41 | 18.0% |
| Marblehead, OH | 858 | 1 | 98.0% |
| Estelline, SD | 858 | 42 | 16.0% |
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