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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 32°F | 21°F | 0.9" |
| February | 15°F | 35°F | 23°F | 1.8" |
| March | 28°F | 50°F | 37°F | 2.8" |
| April | 38°F | 62°F | 49°F | 6.1" |
| May | 49°F | 73°F | 60°F | 4.3" |
| June | 60°F | 83°F | 71°F | 6.2" |
| July | 65°F | 87°F | 76°F | 6.5" |
| August | 62°F | 83°F | 72°F | 6.6" |
| September | 53°F | 77°F | 64°F | 5.9" |
| October | 41°F | 64°F | 51°F | 7.9" |
| November | 28°F | 49°F | 37°F | 1.6" |
| December | 15°F | 33°F | 23°F | 2.2" |
| Index | Alcester | South Dakota | National |
| Air quality index | 36 | 36 | 42 |
| Pollution index | 731,145 | 345,623 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 321 |
| Days with moderate air quality | 43 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.002% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Chatsworth, IA | 58 | 35 | 30.0% |
| Hawarden, IA | 3,136 | 35 | 30.0% |
| Akron, IA | 1,509 | 35 | 30.0% |
| Beresford, SD | 2,460 | 36 | 28.0% |
| Fairview, SD | 144 | 36 | 28.0% |
| Alcester, SD | 976 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Kittredge, CO | 976 | 58 | 16.0% |
| Princeton, IA | 976 | 42 | 16.0% |
| Kingston, OH | 976 | 38 | 24.0% |
| Dawson, TX | 976 | 41 | 18.0% |
| Deltaville, VA | 976 | 40 | 20.0% |
| Alcester, SD | 976 | 36 | 28.0% |
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