| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 13°F | 30°F | 20°F | 0.7" |
| February | 16°F | 36°F | 24°F | 2.3" |
| March | 30°F | 53°F | 39°F | 6.6" |
| April | 39°F | 62°F | 49°F | 7.4" |
| May | 52°F | 75°F | 62°F | 7.0" |
| June | 63°F | 84°F | 72°F | 22.2" |
| July | 67°F | 88°F | 77°F | 6.3" |
| August | 64°F | 86°F | 73°F | 3.9" |
| September | 56°F | 82°F | 67°F | 4.2" |
| October | 44°F | 67°F | 53°F | 7.3" |
| November | 29°F | 52°F | 38°F | 2.0" |
| December | 14°F | 31°F | 21°F | 2.9" |
| Index | Tyndall | South Dakota | National |
| Air quality index | 36 | 36 | 42 |
| Pollution index | 221,442 | 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 | 0.003% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Running Water, SD | 25 | 36 | 28.0% |
| Tabor, SD | 433 | 36 | 28.0% |
| Avon, SD | 795 | 36 | 28.0% |
| Scotland, SD | 658 | 36 | 28.0% |
| Santee, NE | 357 | 36 | 28.0% |
| Tyndall, SD | 1,155 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Shafer, MN | 1,155 | 46 | 8.0% |
| North Haverhill, NH | 1,155 | 34 | 32.0% |
| Olcott, NY | 1,155 | 39 | 22.0% |
| Notre-Dame-du-Portage, QC | 1,155 | n/a | |
| Naco, AZ | 1,156 | 45 | 10.0% |
| Tyndall, SD | 1,155 | 36 | 28.0% |
Here are the best places to live in South Dakota
These are the largest cities in South Dakota
Safest Cities In The US
Check out the 10 most dangerous cities in South Dakota