| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 23°F | 49°F | 34°F | 0.7" |
| February | 26°F | 52°F | 37°F | 1.2" |
| March | 37°F | 64°F | 49°F | 1.8" |
| April | 46°F | 73°F | 58°F | 3.1" |
| May | 55°F | 81°F | 67°F | 3.6" |
| June | 66°F | 92°F | 79°F | 4.5" |
| July | 70°F | 96°F | 82°F | 3.5" |
| August | 68°F | 93°F | 80°F | 3.9" |
| September | 60°F | 86°F | 72°F | 3.0" |
| October | 47°F | 75°F | 59°F | 2.0" |
| November | 35°F | 62°F | 47°F | 1.1" |
| December | 24°F | 48°F | 34°F | 1.3" |
| Index | Harper | Kansas | National |
| Air quality index | 40 | 47 | 42 |
| Pollution index | 222,900 | 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 | 0.000% |
| Lead | 0.001% |
| Mercury | 0.000% |
| City | Population | Air Quality Index | National Avg. |
| Attica, KS | 679 | 40 | 20.0% |
| Norwich, KS | 444 | 40 | 20.0% |
| Argonia, KS | 509 | 40 | 20.0% |
| Freeport, KS | 0 | 40 | 20.0% |
| Spivey, KS | 94 | 40 | 20.0% |
| Harper, KS | 1,295 | 40 | 20.0% |
| City | Population | Air Quality Index | National Avg. |
| Marcus, IA | 1,295 | 35 | 30.0% |
| Dellwood, MN | 1,295 | 46 | 8.0% |
| Robinhood, MS | 1,295 | 44 | 12.0% |
| Oxford, NS | 1,295 | n/a | |
| Canton Valley, CT | 1,294 | 41 | 18.0% |
| Harper, KS | 1,295 | 40 | 20.0% |
Here are the best places to live in Kansas
Check out the 10 safest cities in Kansas
These are the largest cities in Kansas
Check out the 10 most dangerous cities in Kansas