| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 42°F | 33°F | 6.4" |
| February | 29°F | 49°F | 38°F | 2.5" |
| March | 41°F | 65°F | 51°F | 5.1" |
| April | 46°F | 68°F | 56°F | 2.7" |
| May | 58°F | 79°F | 68°F | 8.3" |
| June | 67°F | 86°F | 76°F | 13.8" |
| July | 68°F | 90°F | 78°F | 9.0" |
| August | 71°F | 93°F | 81°F | 6.8" |
| September | 63°F | 86°F | 73°F | 4.5" |
| October | 51°F | 74°F | 61°F | 5.7" |
| November | 37°F | 63°F | 48°F | 2.4" |
| December | 23°F | 46°F | 33°F | 0.9" |
| Index | Oswego | Kansas | National |
| Air quality index | 38 | 47 | 42 |
| Pollution index | 947,958 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 363 |
| Days with good air quality | 289 |
| Days with moderate air quality | 73 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Roseland, KS | 66 | 37 | 26.0% |
| West Mineral, KS | 124 | 37 | 26.0% |
| McCune, KS | 318 | 38 | 24.0% |
| Parsons, KS | 9,648 | 38 | 24.0% |
| Altamont, KS | 1,055 | 38 | 24.0% |
| Oswego, KS | 1,683 | 38 | 24.0% |
| City | Population | Air Quality Index | National Avg. |
| Cedar Bluff, AL | 1,683 | 39 | 22.0% |
| Mount Pulaski, IL | 1,683 | 44 | 12.0% |
| Lakefield, MN | 1,683 | 32 | 36.0% |
| Houghton, NY | 1,683 | 39 | 22.0% |
| Rouse, CA | 1,684 | 49 | 2.0% |
| Oswego, KS | 1,683 | 38 | 24.0% |
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