| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 24°F | 47°F | 34°F | 2.7" |
| February | 27°F | 50°F | 37°F | 3.9" |
| March | 39°F | 62°F | 49°F | 7.8" |
| April | 48°F | 71°F | 58°F | 7.4" |
| May | 57°F | 78°F | 67°F | 10.0" |
| June | 68°F | 89°F | 78°F | 11.9" |
| July | 71°F | 93°F | 81°F | 10.2" |
| August | 69°F | 91°F | 79°F | 8.3" |
| September | 61°F | 84°F | 71°F | 9.5" |
| October | 49°F | 72°F | 59°F | 7.3" |
| November | 37°F | 60°F | 47°F | 5.3" |
| December | 26°F | 46°F | 35°F | 3.9" |
| Index | Derby | 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. |
| Maize, KS | 5,044 | 40 | 20.0% |
| Eastborough, KS | 755 | 40 | 20.0% |
| Haysville, KS | 11,260 | 40 | 20.0% |
| Mulvane, KS | 6,025 | 40 | 20.0% |
| Belle Plaine, KS | 1,473 | 40 | 20.0% |
| Derby, KS | 24,428 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Essa, ON | 24,435 | n/a | |
| Candler-McAfee, GA | 24,419 | 52 | 4.0% |
| Farmington, UT | 24,439 | 51 | 2.0% |
| Wilsonville, OR | 24,413 | 38 | 24.0% |
| Norfolk, NE | 24,410 | 35 | 30.0% |
| Derby, KS | 24,428 | 40 | 20.0% |
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