| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 34°F | 20°F | 0.6" |
| February | 15°F | 35°F | 23°F | 0.9" |
| March | 27°F | 54°F | 38°F | 1.4" |
| April | 34°F | 59°F | 45°F | 2.9" |
| May | 44°F | 69°F | 55°F | 5.2" |
| June | 55°F | 81°F | 67°F | 6.0" |
| July | 63°F | 93°F | 76°F | 9.1" |
| August | 59°F | 87°F | 71°F | 3.5" |
| September | 51°F | 82°F | 64°F | 1.5" |
| October | 39°F | 65°F | 49°F | 3.1" |
| November | 26°F | 50°F | 35°F | 0.9" |
| December | 14°F | 33°F | 22°F | 1.3" |
| Index | Dupree | South Dakota | National |
| Air quality index | 44 | 36 | 42 |
| Pollution index | 95,587 | 345,623 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 274 |
| Days with moderate air quality | 87 |
| Days w/ poor A.Q. for sensitive groups | 4 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.001% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Dupree, SD | 486 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Guy, AR | 486 | 45 | 10.0% |
| Sacaton Flats Village, AZ | 486 | 74 | 48.0% |
| St. Ann Highlands, CO | 486 | 47 | 6.0% |
| Lemon Grove, FL | 486 | 36 | 28.0% |
| Maharishi Vedic City, IA | 486 | 29 | 42.0% |
| Dupree, SD | 486 | 44 | 12.0% |
Here are the best places to live in South Dakota
These are the 10 cheapest cities in South Dakota
These are the largest cities in South Dakota
Safest States In The US