| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 44°F | 31°F | 0.4" |
| February | 24°F | 47°F | 34°F | 1.5" |
| March | 36°F | 61°F | 46°F | 2.4" |
| April | 45°F | 70°F | 56°F | 4.5" |
| May | 55°F | 77°F | 65°F | 5.2" |
| June | 65°F | 87°F | 75°F | 5.2" |
| July | 68°F | 91°F | 79°F | 4.4" |
| August | 66°F | 90°F | 77°F | 4.8" |
| September | 58°F | 82°F | 69°F | 3.8" |
| October | 46°F | 71°F | 57°F | 3.2" |
| November | 35°F | 59°F | 45°F | 1.4" |
| December | 24°F | 45°F | 33°F | 1.4" |
| Index | Gridley | Kansas | National |
| Air quality index | 22 | 47 | 42 |
| Pollution index | 1,288,380 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 60 |
| Days with good air quality | 55 |
| Days with moderate air quality | 4 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.000% |
| Benzene | 0.020% |
| Carbon Tetrachloride | 0.002% |
| Lead | 0.005% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| LeRoy, KS | 579 | 22 | 56.0% |
| New Strawn, KS | 423 | 22 | 56.0% |
| Madison, KS | 788 | 22 | 56.0% |
| Virgil, KS | 38 | 22 | 56.0% |
| Hartford, KS | 338 | 22 | 56.0% |
| Gridley, KS | 355 | 22 | 56.0% |
| City | Population | Air Quality Index | National Avg. |
| Rockford Bay, ID | 355 | 43 | 14.0% |
| Latham, IL | 355 | 44 | 12.0% |
| Ransom, IL | 355 | 0 | 100.0% |
| Spottsville, KY | 355 | 45 | 10.0% |
| Branch, LA | 355 | 41 | 18.0% |
| Gridley, KS | 355 | 22 | 56.0% |
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