| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 21°F | 42°F | 30°F | 0.8" |
| February | 23°F | 45°F | 33°F | 1.6" |
| March | 36°F | 59°F | 46°F | 2.5" |
| April | 45°F | 68°F | 56°F | 4.4" |
| May | 55°F | 76°F | 65°F | 5.4" |
| June | 65°F | 87°F | 75°F | 6.1" |
| July | 68°F | 90°F | 79°F | 4.9" |
| August | 67°F | 89°F | 77°F | 5.2" |
| September | 59°F | 81°F | 68°F | 4.3" |
| October | 46°F | 69°F | 57°F | 3.7" |
| November | 35°F | 57°F | 45°F | 1.7" |
| December | 24°F | 43°F | 33°F | 1.8" |
| Index | Osawatomie | Kansas | National |
| Air quality index | 47 | 47 | 42 |
| Pollution index | 8,275,060 | 989,153 | 2,726,193 |
| Measurement | Total |
| Days measured | 365 |
| Days with good air quality | 210 |
| Days with moderate air quality | 154 |
| Days w/ poor A.Q. for sensitive groups | 1 |
| Days with unhealthy air quality | 0 |
| Pollutant | Total |
| Arsenic | 0.300% |
| Benzene | 0.010% |
| Carbon Tetrachloride | 0.001% |
| Lead | 0.080% |
| Mercury | 0.190% |
| City | Population | Air Quality Index | National Avg. |
| Rantoul, KS | 216 | 41 | 18.0% |
| Lane, KS | 217 | 41 | 18.0% |
| Wellsville, KS | 1,921 | 41 | 18.0% |
| Greeley, KS | 354 | 41 | 18.0% |
| Fontana, KS | 490 | 47 | 6.0% |
| Osawatomie, KS | 4,279 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Sellersville, PA | 4,279 | 42 | 16.0% |
| Argyle, TX | 4,278 | 51 | 2.0% |
| Prescott, WI | 4,278 | 37 | 26.0% |
| Waimanalo Beach, HI | 4,280 | 30 | 40.0% |
| Millinocket, ME | 4,280 | 31 | 38.0% |
| Osawatomie, KS | 4,279 | 47 | 6.0% |
Here are the best places to live in Kansas
See the best places to live in Osawatomie
Check out the 10 safest cities in Kansas
Check out the 10 most dangerous cities in Kansas