| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 43°F | 29°F | 3.0" |
| February | 23°F | 47°F | 34°F | 5.6" |
| March | 35°F | 62°F | 47°F | 8.8" |
| April | 45°F | 69°F | 56°F | 12.1" |
| May | 55°F | 78°F | 65°F | 8.9" |
| June | 66°F | 88°F | 77°F | 10.5" |
| July | 69°F | 92°F | 80°F | 6.3" |
| August | 67°F | 90°F | 78°F | 8.3" |
| September | 59°F | 83°F | 70°F | 7.4" |
| October | 46°F | 71°F | 57°F | 6.6" |
| November | 34°F | 58°F | 45°F | 7.2" |
| December | 22°F | 43°F | 32°F | 4.7" |
| Index | Chapman | Kansas | National |
| Air quality index | 32 | 47 | 42 |
| Pollution index | 438,885 | 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. |
| Enterprise, KS | 818 | 32 | 36.0% |
| Milford, KS | 347 | 32 | 36.0% |
| Fort Riley, KS | 8,720 | 32 | 36.0% |
| Talmage, KS | 129 | 32 | 36.0% |
| Abilene, KS | 6,258 | 32 | 36.0% |
| Chapman, KS | 1,209 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Millport, AL | 1,209 | 35 | 30.0% |
| Genesee, ID | 1,209 | 29 | 42.0% |
| Lincoln Center, KS | 1,209 | 32 | 36.0% |
| Eaton Estates, OH | 1,209 | 50 | = 100 |
| Ruch, OR | 1,209 | 36 | 28.0% |
| Chapman, KS | 1,209 | 32 | 36.0% |
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