| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 20°F | 43°F | 30°F | 0.6" |
| February | 23°F | 47°F | 34°F | 1.2" |
| March | 35°F | 60°F | 46°F | 2.5" |
| April | 45°F | 70°F | 56°F | 4.4" |
| May | 54°F | 77°F | 65°F | 5.6" |
| June | 65°F | 88°F | 76°F | 5.2" |
| July | 69°F | 92°F | 79°F | 4.2" |
| August | 67°F | 90°F | 77°F | 4.9" |
| September | 58°F | 82°F | 69°F | 4.1" |
| October | 46°F | 71°F | 57°F | 3.8" |
| November | 34°F | 58°F | 45°F | 1.5" |
| December | 23°F | 44°F | 33°F | 1.6" |
| Index | Lyndon | Kansas | National |
| Air quality index | 41 | 47 | 42 |
| Pollution index | 1,288,380 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 294 |
| Days with moderate air quality | 70 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Olivet, KS | 62 | 22 | 56.0% |
| Reading, KS | 165 | 22 | 56.0% |
| Osage City, KS | 2,804 | 22 | 56.0% |
| Williamsburg, KS | 342 | 22 | 56.0% |
| Lebo, KS | 722 | 22 | 56.0% |
| Lyndon, KS | 1,074 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Stevensville, MI | 1,074 | 39 | 22.0% |
| Ship Bottom, NJ | 1,074 | 37 | 26.0% |
| Plum Grove, TX | 1,074 | 52 | 4.0% |
| Alderson, WV | 1,074 | 295 | 490.0% |
| Prince, ON | 1,074 | n/a | |
| Lyndon, KS | 1,074 | 41 | 18.0% |
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