| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 42°F | 30°F | 0.8" |
| February | 23°F | 45°F | 33°F | 1.6" |
| March | 36°F | 59°F | 46°F | 2.5" |
| April | 45°F | 68°F | 56°F | 4.4" |
| May | 55°F | 76°F | 65°F | 5.4" |
| June | 65°F | 87°F | 75°F | 6.1" |
| July | 68°F | 90°F | 79°F | 4.9" |
| August | 67°F | 89°F | 77°F | 5.2" |
| September | 59°F | 81°F | 68°F | 4.3" |
| October | 46°F | 69°F | 57°F | 3.7" |
| November | 35°F | 57°F | 45°F | 1.7" |
| December | 24°F | 43°F | 33°F | 1.8" |
| Index | La Cygne | Kansas | National |
| Air quality index | 47 | 47 | 42 |
| Pollution index | 8,275,060 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 210 |
| Days with moderate air quality | 154 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.300% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.080% |
| Mercury | 0.190% |
| City | Population | Air Quality Index | National Avg. |
| Amoret, MO | 153 | 47 | 6.0% |
| Linn Valley, KS | 861 | 47 | 6.0% |
| Merwin, MO | 57 | 47 | 6.0% |
| Pleasanton, KS | 1,433 | 47 | 6.0% |
| Osawatomie, KS | 4,279 | 47 | 6.0% |
| La Cygne, KS | 1,169 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Stem, NC | 1,169 | 44 | 12.0% |
| Mesita, NM | 1,169 | 53 | 6.0% |
| Baltic, SD | 1,169 | 36 | 28.0% |
| Despard, WV | 1,169 | 31 | 38.0% |
| Malaga, CA | 1,168 | 60 | 20.0% |
| La Cygne, KS | 1,169 | 47 | 6.0% |
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