| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 19°F | 44°F | 30°F | 0.3" |
| February | 21°F | 48°F | 33°F | 0.3" |
| March | 31°F | 62°F | 44°F | 1.2" |
| April | 40°F | 69°F | 53°F | 2.9" |
| May | 50°F | 78°F | 63°F | 3.5" |
| June | 62°F | 91°F | 75°F | 2.7" |
| July | 67°F | 96°F | 80°F | 3.5" |
| August | 64°F | 91°F | 76°F | 3.9" |
| September | 55°F | 84°F | 68°F | 2.7" |
| October | 42°F | 71°F | 55°F | 2.1" |
| November | 29°F | 59°F | 42°F | 0.5" |
| December | 19°F | 43°F | 30°F | 0.8" |
| Index | Grinnell | Kansas | National |
| Air quality index | 15 | 47 | 42 |
| Pollution index | 214,827 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 304 |
| Days with good air quality | 301 |
| Days with moderate air quality | 3 |
| 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. |
| Park, KS | 147 | 15 | 70.0% |
| Gove City, KS | 99 | 15 | 70.0% |
| Grainfield, KS | 329 | 15 | 70.0% |
| Oakley, KS | 2,070 | 15 | 70.0% |
| Grinnell, KS | 274 | 15 | 70.0% |
| City | Population | Air Quality Index | National Avg. |
| Wilmar, AR | 274 | 35 | 30.0% |
| Top-of-the-World, AZ | 274 | 60 | 20.0% |
| Manlius, IL | 274 | 42 | 16.0% |
| Perry, IL | 274 | 41 | 18.0% |
| Gamaliel, KY | 274 | 25 | 50.0% |
| Grinnell, KS | 274 | 15 | 70.0% |
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