| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 26°F | 43°F | 33°F | 4.8" |
| February | 31°F | 51°F | 40°F | 3.4" |
| March | 42°F | 66°F | 53°F | 10.7" |
| April | 47°F | 69°F | 57°F | 2.0" |
| May | 60°F | 79°F | 69°F | 8.9" |
| June | 68°F | 87°F | 77°F | 19.0" |
| July | 70°F | 92°F | 81°F | 8.2" |
| August | 73°F | 93°F | 83°F | 9.2" |
| September | 65°F | 88°F | 75°F | 6.1" |
| October | 53°F | 75°F | 62°F | 8.0" |
| November | 38°F | 64°F | 50°F | 0.1" |
| December | 25°F | 46°F | 34°F | 3.5" |
| Index | Winfield | Kansas | National |
| Air quality index | 40 | 47 | 42 |
| Pollution index | 1,591,610 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 292 |
| Days with moderate air quality | 72 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.030% |
| Mercury | 0.005% |
| City | Population | Air Quality Index | National Avg. |
| Arkansas City, KS | 11,767 | 40 | 20.0% |
| Oxford, KS | 1,046 | 40 | 20.0% |
| Dexter, KS | 604 | 40 | 20.0% |
| Geuda Springs, KS | 133 | 40 | 20.0% |
| Udall, KS | 741 | 40 | 20.0% |
| Winfield, KS | 11,990 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Fuller Heights, FL | 11,989 | 36 | 28.0% |
| Brown Deer, WI | 11,987 | 44 | 12.0% |
| Cloquet, MN | 11,994 | 35 | 30.0% |
| Wetaskiwin County No. 10, AB | 11,985 | n/a | |
| Norton, OH | 11,984 | 43 | 14.0% |
| Winfield, KS | 11,990 | 40 | 20.0% |
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