| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 5°F | 32°F | 17°F | 0.2" |
| February | 10°F | 34°F | 21°F | 0.6" |
| March | 23°F | 51°F | 35°F | 1.7" |
| April | 29°F | 58°F | 43°F | 1.8" |
| May | 40°F | 67°F | 53°F | 5.9" |
| June | 52°F | 78°F | 64°F | 5.0" |
| July | 57°F | 91°F | 74°F | 3.8" |
| August | 52°F | 85°F | 68°F | 3.4" |
| September | 43°F | 77°F | 59°F | 1.9" |
| October | 32°F | 61°F | 45°F | 0.6" |
| November | 20°F | 46°F | 32°F | 0.9" |
| December | 8°F | 31°F | 19°F | 0.8" |
| Index | Lemmon | South Dakota | National |
| Air quality index | 33 | 36 | 42 |
| Pollution index | 574,188 | 345,623 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 354 |
| Days with moderate air quality | 11 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Haynes, ND | 37 | 33 | 34.0% |
| Lemmon, SD | 1,288 | 33 | 34.0% |
| City | Population | Air Quality Index | National Avg. |
| Walnut Grove, CA | 1,288 | 52 | 4.0% |
| Maple Bluff, WI | 1,288 | 39 | 22.0% |
| Bear Creek, AK | 1,287 | 31 | 38.0% |
| Lake Catherine, IL | 1,289 | 39 | 22.0% |
| Toluca, IL | 1,287 | 0 | 100.0% |
| Lemmon, SD | 1,288 | 33 | 34.0% |
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