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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 40°F | 27°F | 1.2" |
| February | 18°F | 40°F | 27°F | 1.3" |
| March | 31°F | 56°F | 41°F | 1.7" |
| April | 35°F | 58°F | 45°F | 11.2" |
| May | 46°F | 69°F | 56°F | 12.4" |
| June | 57°F | 81°F | 68°F | 3.1" |
| July | 65°F | 93°F | 78°F | 3.2" |
| August | 61°F | 87°F | 73°F | 5.4" |
| September | 51°F | 81°F | 64°F | 1.4" |
| October | 40°F | 64°F | 50°F | 36.4" |
| November | 29°F | 51°F | 39°F | 3.7" |
| December | 17°F | 35°F | 24°F | 1.5" |
| Index | Box Elder | South Dakota | National |
| Air quality index | 44 | 36 | 42 |
| Pollution index | 551,228 | 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 | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Piedmont, SD | 1,188 | 44 | 12.0% |
| Blackhawk, SD | 3,029 | 44 | 12.0% |
| Rapid City, SD | 76,541 | 44 | 12.0% |
| Summerset, SD | 2,607 | 44 | 12.0% |
| Caputa, SD | 0 | 44 | 12.0% |
| Box Elder, SD | 9,937 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Clay, AL | 9,936 | 53 | 6.0% |
| Gages Lake, IL | 9,939 | 39 | 22.0% |
| Queens, NS | 9,932 | n/a | |
| Fort Salonga, NY | 9,930 | 43 | 14.0% |
| Astoria, OR | 9,929 | 18 | 64.0% |
| Box Elder, SD | 9,937 | 44 | 12.0% |