| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 12°F | 33°F | 22°F | 0.6" |
| February | 14°F | 36°F | 23°F | 0.9" |
| March | 26°F | 51°F | 37°F | 1.3" |
| April | 36°F | 62°F | 48°F | 3.0" |
| May | 47°F | 72°F | 59°F | 3.3" |
| June | 58°F | 83°F | 70°F | 4.7" |
| July | 64°F | 90°F | 76°F | 2.6" |
| August | 61°F | 86°F | 73°F | 3.0" |
| September | 52°F | 79°F | 64°F | 2.2" |
| October | 39°F | 64°F | 50°F | 2.5" |
| November | 26°F | 50°F | 37°F | 0.5" |
| December | 14°F | 33°F | 22°F | 0.9" |
| Index | Geddes | South Dakota | National |
| Air quality index | 36 | 36 | 42 |
| Pollution index | 296,415 | 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 | 0.005% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Ravinia, SD | 56 | 36 | 28.0% |
| Platte, SD | 1,290 | 36 | 28.0% |
| Bonesteel, SD | 386 | 36 | 28.0% |
| Corsica, SD | 729 | 36 | 28.0% |
| Lake Andes, SD | 946 | 36 | 28.0% |
| Geddes, SD | 187 | 36 | 28.0% |
| City | Population | Air Quality Index | National Avg. |
| Fox, AK | 187 | 38 | 24.0% |
| Morristown, AZ | 187 | 74 | 48.0% |
| Coffee Creek, CA | 187 | 42 | 16.0% |
| Markleeville, CA | 187 | 13 | 74.0% |
| Henlopen Acres, DE | 187 | 36 | 28.0% |
| Geddes, SD | 187 | 36 | 28.0% |
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