| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 18°F | 42°F | 29°F | 0.6" |
| February | 21°F | 47°F | 32°F | 0.7" |
| March | 31°F | 60°F | 45°F | 1.4" |
| April | 41°F | 68°F | 54°F | 3.0" |
| May | 50°F | 77°F | 63°F | 4.8" |
| June | 62°F | 89°F | 75°F | 4.6" |
| July | 66°F | 93°F | 79°F | 4.2" |
| August | 63°F | 89°F | 76°F | 5.2" |
| September | 55°F | 83°F | 68°F | 3.4" |
| October | 43°F | 71°F | 56°F | 2.5" |
| November | 31°F | 58°F | 43°F | 0.9" |
| December | 19°F | 43°F | 30°F | 1.3" |
| Index | Delphos | Kansas | National |
| Air quality index | 32 | 47 | 42 |
| Pollution index | 190,007 | 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 | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Simpson, KS | 76 | 32 | 36.0% |
| Minneapolis, KS | 1,786 | 32 | 36.0% |
| Aurora, KS | 76 | 32 | 36.0% |
| Asherville, KS | 0 | 32 | 36.0% |
| Ada, KS | 148 | 32 | 36.0% |
| Delphos, KS | 384 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Plainville, GA | 384 | 44 | 12.0% |
| Woodland, GA | 384 | 42 | 16.0% |
| Pierce, ID | 384 | 29 | 42.0% |
| Monroe Center, IL | 384 | 42 | 16.0% |
| Olivet, IL | 384 | 45 | 10.0% |
| Delphos, KS | 384 | 32 | 36.0% |
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