| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 11°F | 38°F | 24°F | 0.4" |
| February | 14°F | 41°F | 26°F | 0.4" |
| March | 25°F | 57°F | 39°F | 0.8" |
| April | 33°F | 62°F | 46°F | 2.3" |
| May | 41°F | 71°F | 55°F | 3.0" |
| June | 52°F | 84°F | 67°F | 2.9" |
| July | 59°F | 92°F | 75°F | 2.2" |
| August | 56°F | 90°F | 72°F | 1.7" |
| September | 47°F | 81°F | 62°F | 1.2" |
| October | 34°F | 65°F | 48°F | 1.3" |
| November | 21°F | 52°F | 36°F | 0.7" |
| December | 10°F | 37°F | 23°F | 0.5" |
| Index | Porcupine | South Dakota | National |
| Air quality index | 44 | 36 | 42 |
| Pollution index | 193,792 | 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 | 0.004% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Manderson-White Horse Creek, SD | 405 | 44 | 12.0% |
| Wounded Knee, SD | 197 | 44 | 12.0% |
| Batesland, SD | 82 | 44 | 12.0% |
| Kyle, SD | 902 | 44 | 12.0% |
| Porcupine, SD | 1,381 | 44 | 12.0% |
| City | Population | Air Quality Index | National Avg. |
| Gilcrest, CO | 1,381 | 45 | 10.0% |
| Springfield, CO | 1,381 | 20 | 60.0% |
| Kingsford Heights, IN | 1,381 | 37 | 26.0% |
| Fairmount Heights, MD | 1,381 | 47 | 6.0% |
| Ligonier, PA | 1,381 | 39 | 22.0% |
| Porcupine, SD | 1,381 | 44 | 12.0% |
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