| 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 | Grenola | Kansas | National |
| Air quality index | 40 | 47 | 42 |
| Pollution index | 235,434 | 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 | 0.001% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Moline, KS | 340 | 40 | 20.0% |
| Latham, KS | 236 | 40 | 20.0% |
| Dexter, KS | 604 | 40 | 20.0% |
| Howard, KS | 668 | 40 | 20.0% |
| Elk Falls, KS | 104 | 40 | 20.0% |
| Grenola, KS | 180 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Fort Apache, AZ | 180 | 44 | 12.0% |
| San Simon, AZ | 180 | 37 | 26.0% |
| Alston, GA | 180 | 26 | 48.0% |
| Rentz, GA | 180 | 38 | 24.0% |
| Auburn, IA | 180 | 37 | 26.0% |
| Grenola, KS | 180 | 40 | 20.0% |
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