| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 38°F | 28°F | 2.5" |
| February | 23°F | 46°F | 33°F | 3.8" |
| March | 36°F | 62°F | 47°F | 3.0" |
| April | 42°F | 67°F | 54°F | 5.1" |
| May | 55°F | 78°F | 66°F | 11.4" |
| June | 66°F | 86°F | 75°F | 14.3" |
| July | 67°F | 91°F | 78°F | 5.0" |
| August | 69°F | 92°F | 79°F | 9.0" |
| September | 59°F | 84°F | 70°F | 7.8" |
| October | 47°F | 71°F | 57°F | 6.5" |
| November | 30°F | 59°F | 44°F | 3.0" |
| December | 18°F | 41°F | 29°F | 1.6" |
| Index | Onaga | Kansas | National |
| Air quality index | 32 | 47 | 42 |
| Pollution index | 308,193 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 95 |
| Days with good air quality | 94 |
| Days with moderate air quality | 1 |
| Days w/ poor A.Q. for sensitive groups | |
| Days with unhealthy air quality |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Corning, KS | 150 | 32 | 36.0% |
| Westmoreland, KS | 704 | 32 | 36.0% |
| Frankfort, KS | 729 | 32 | 36.0% |
| Havensville, KS | 127 | 32 | 36.0% |
| Wheaton, KS | 94 | 32 | 36.0% |
| Onaga, KS | 709 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Two Rivers, AK | 709 | 38 | 24.0% |
| Hartford, IA | 709 | 39 | 22.0% |
| Conway, MO | 709 | 39 | 22.0% |
| Silver Springs, NY | 709 | 37 | 26.0% |
| Welling, OK | 709 | 36 | 28.0% |
| Onaga, KS | 709 | 32 | 36.0% |
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