| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 6°F | 25°F | 15°F | 6.8" |
| February | 10°F | 31°F | 20°F | 2.6" |
| March | 22°F | 45°F | 33°F | 1.9" |
| April | 34°F | 59°F | 46°F | 2.3" |
| May | 45°F | 70°F | 57°F | 4.2" |
| June | 56°F | 80°F | 68°F | 5.5" |
| July | 60°F | 84°F | 72°F | 3.6" |
| August | 57°F | 81°F | 69°F | 3.9" |
| September | 49°F | 75°F | 61°F | 2.2" |
| October | 36°F | 61°F | 48°F | 2.5" |
| November | 24°F | 46°F | 34°F | 1.2" |
| December | 10°F | 28°F | 19°F | 3.4" |
| Index | Garretson | South Dakota | National |
| Air quality index | 36 | 36 | 42 |
| Pollution index | 2,464,570 | 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 | 0.030% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.020% |
| Mercury | 0.001% |
| City | Population | Air Quality Index | National Avg. |
| Beaver Creek, MN | 341 | 36 | 28.0% |
| Trosky, MN | 73 | 36 | 28.0% |
| Baltic, SD | 1,169 | 36 | 28.0% |
| Pine Lakes Addition, SD | 329 | 36 | 28.0% |
| Trent, SD | 301 | 36 | 28.0% |
| Garretson, SD | 1,493 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Bedford, IA | 1,493 | 43 | 14.0% |
| Traer, IA | 1,493 | 39 | 22.0% |
| Durand, IL | 1,493 | 42 | 16.0% |
| Redkey, IN | 1,493 | 35 | 30.0% |
| Naples, TX | 1,493 | 39 | 22.0% |
| Garretson, SD | 1,493 | 36 | 28.0% |
Here are the best places to live in South Dakota
Check out the 10 safest cities in South Dakota
See the best places to live in Garretson
Most Dangerous States In The US