| 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% |
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