| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 42°F | 31°F | 0.4" |
| February | 25°F | 45°F | 34°F | 0.6" |
| March | 39°F | 60°F | 48°F | 2.4" |
| April | 47°F | 69°F | 57°F | 3.1" |
| May | 58°F | 79°F | 68°F | 6.6" |
| June | 70°F | 92°F | 80°F | 5.9" |
| July | 75°F | 96°F | 84°F | 2.9" |
| August | 73°F | 96°F | 83°F | 2.5" |
| September | 61°F | 83°F | 71°F | 2.7" |
| October | 49°F | 71°F | 59°F | 2.8" |
| November | 38°F | 59°F | 47°F | 0.8" |
| December | 25°F | 43°F | 33°F | 1.4" |
| Index | Riley | Kansas | National |
| Air quality index | 32 | 47 | 42 |
| Pollution index | 81,192 | 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 | 0.002% |
| Carbon Tetrachloride | 0.000% |
| Lead | 0.000% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Leonardville, KS | 647 | 32 | 36.0% |
| Manhattan, KS | 55,045 | 32 | 36.0% |
| Olsburg, KS | 276 | 32 | 36.0% |
| Milford, KS | 347 | 32 | 36.0% |
| Randolph, KS | 168 | 32 | 36.0% |
| Riley, KS | 1,265 | 32 | 36.0% |
| City | Population | Air Quality Index | National Avg. |
| Carey, ID | 1,265 | 20 | 60.0% |
| New Sarpy, LA | 1,265 | 45 | 10.0% |
| Weidman, MI | 1,265 | 36 | 28.0% |
| North Ballston Spa, NY | 1,265 | 37 | 26.0% |
| Windsor, PA | 1,265 | 41 | 18.0% |
| Riley, KS | 1,265 | 32 | 36.0% |
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