| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 48°F | 35°F | 0.6" |
| February | 27°F | 51°F | 38°F | 1.3" |
| March | 39°F | 64°F | 50°F | 2.6" |
| April | 47°F | 72°F | 59°F | 3.7" |
| May | 56°F | 79°F | 67°F | 5.0" |
| June | 67°F | 90°F | 78°F | 6.0" |
| July | 71°F | 94°F | 82°F | 4.2" |
| August | 69°F | 92°F | 80°F | 4.5" |
| September | 61°F | 85°F | 72°F | 2.5" |
| October | 49°F | 74°F | 60°F | 2.8" |
| November | 37°F | 61°F | 48°F | 1.6" |
| December | 26°F | 48°F | 36°F | 1.4" |
| Index | Wellington | Kansas | National |
| Air quality index | 40 | 47 | 42 |
| Pollution index | 222,900 | 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 | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Udall, KS | 741 | 40 | 20.0% |
| Mayfield, KS | 63 | 40 | 20.0% |
| Mulvane, KS | 6,025 | 40 | 20.0% |
| Oxford, KS | 1,046 | 40 | 20.0% |
| Belle Plaine, KS | 1,473 | 40 | 20.0% |
| Wellington, KS | 7,716 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Union, SC | 7,716 | 44 | 12.0% |
| Fort Scott, KS | 7,715 | 37 | 26.0% |
| Waite Park, MN | 7,719 | 32 | 36.0% |
| Leola, PA | 7,720 | 45 | 10.0% |
| Citrus Hills, FL | 7,711 | 30 | 40.0% |
| Wellington, KS | 7,716 | 40 | 20.0% |
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