| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 44°F | 32°F | 2.8" |
| February | 25°F | 47°F | 34°F | 5.4" |
| March | 37°F | 60°F | 46°F | 4.8" |
| April | 45°F | 69°F | 55°F | 6.0" |
| May | 55°F | 76°F | 64°F | 8.9" |
| June | 66°F | 89°F | 76°F | 10.3" |
| July | 69°F | 92°F | 80°F | 7.9" |
| August | 67°F | 90°F | 77°F | 9.3" |
| September | 59°F | 82°F | 69°F | 7.1" |
| October | 47°F | 70°F | 57°F | 6.2" |
| November | 36°F | 58°F | 45°F | 3.0" |
| December | 24°F | 44°F | 33°F | 3.9" |
| Index | Newton | Kansas | National |
| Air quality index | 40 | 47 | 42 |
| Pollution index | 438,885 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 301 |
| Days with moderate air quality | 64 |
| 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 | 0.001% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Goessel, KS | 687 | 40 | 20.0% |
| Sedgwick, KS | 1,514 | 40 | 20.0% |
| Halstead, KS | 2,197 | 40 | 20.0% |
| Hesston, KS | 4,046 | 40 | 20.0% |
| Whitewater, KS | 1,028 | 40 | 20.0% |
| Newton, KS | 18,846 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Franklin Farm, VA | 18,845 | 47 | 6.0% |
| Alsip, IL | 18,843 | 55 | 10.0% |
| Alice, TX | 18,859 | 30 | 40.0% |
| Bellaire, TX | 18,862 | 52 | 4.0% |
| Claremore, OK | 18,875 | 45 | 10.0% |
| Newton, KS | 18,846 | 40 | 20.0% |
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