| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 45°F | 31°F | 1.0" |
| February | 22°F | 49°F | 34°F | 1.5" |
| March | 34°F | 62°F | 47°F | 2.6" |
| April | 44°F | 71°F | 57°F | 4.2" |
| May | 53°F | 79°F | 66°F | 5.6" |
| June | 65°F | 89°F | 77°F | 5.5" |
| July | 68°F | 93°F | 80°F | 4.4" |
| August | 66°F | 91°F | 78°F | 5.2" |
| September | 57°F | 84°F | 69°F | 4.4" |
| October | 44°F | 73°F | 57°F | 3.3" |
| November | 33°F | 61°F | 46°F | 1.6" |
| December | 22°F | 46°F | 33°F | 1.8" |
| Index | Grantville | Kansas | National |
| Air quality index | 41 | 47 | 42 |
| Pollution index | 1,138,800 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 294 |
| Days with moderate air quality | 70 |
| Days w/ poor A.Q. for sensitive groups | 0 |
| Days with unhealthy air quality | 1 |
| Pollutant | Total |
| Arsenic | 0.001% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.004% |
| Lead | 0.010% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Wakarusa, KS | 223 | 41 | 18.0% |
| Lecompton, KS | 857 | 41 | 18.0% |
| Hoyt, KS | 600 | 41 | 18.0% |
| Oskaloosa, KS | 1,229 | 41 | 18.0% |
| Meriden, KS | 781 | 41 | 18.0% |
| Grantville, KS | 206 | 41 | 18.0% |
| City | Population | Air Quality Index | National Avg. |
| Hobson, AL | 206 | 42 | 16.0% |
| Almyra, AR | 206 | 45 | 10.0% |
| Jakes Corner, AZ | 206 | 60 | 20.0% |
| Dos Palos Y, CA | 206 | 48 | 4.0% |
| Dickens, IA | 206 | 35 | 30.0% |
| Grantville, KS | 206 | 41 | 18.0% |
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