| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 10°F | 30°F | 20°F | 0.4" |
| February | 14°F | 36°F | 24°F | 0.5" |
| March | 24°F | 51°F | 35°F | 0.5" |
| April | 34°F | 61°F | 46°F | 2.1" |
| May | 44°F | 71°F | 57°F | 3.3" |
| June | 56°F | 83°F | 69°F | 4.0" |
| July | 62°F | 91°F | 76°F | 2.3" |
| August | 59°F | 87°F | 72°F | 2.3" |
| September | 50°F | 80°F | 63°F | 1.4" |
| October | 39°F | 65°F | 50°F | 1.4" |
| November | 24°F | 48°F | 35°F | 0.4" |
| December | 13°F | 32°F | 21°F | 0.7" |
| Index | Pierre | South Dakota | National |
| Air quality index | 20 | 36 | 42 |
| Pollution index | 300,739 | 345,623 | 2,726,193 |
| Measurement | Total |
| Days measured | 122 |
| Days with good air quality | 112 |
| Days with moderate air quality | 10 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Cow Creek, SD | 90 | 20 | 60.0% |
| Fort Pierre, SD | 2,487 | 20 | 60.0% |
| Pierre, SD | 13,908 | 20 | 60.0% |
| City | Population | Air Quality Index | National Avg. |
| Loveland, OH | 13,911 | 54 | 8.0% |
| Hudson, WI | 13,912 | 46 | 8.0% |
| North Mankato, MN | 13,903 | 46 | 8.0% |
| Waunakee, WI | 13,903 | 39 | 22.0% |
| Bloomsburg, PA | 13,916 | 35 | 30.0% |
| Pierre, SD | 13,908 | 20 | 60.0% |
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