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| Month | Temp. (min) | Temp. (max) | Temp. (avg) | Precipitation |
| January | 22°F | 42°F | 30°F | 0.6" |
| February | 24°F | 45°F | 33°F | 1.3" |
| March | 37°F | 59°F | 46°F | 2.4" |
| April | 46°F | 68°F | 56°F | 4.4" |
| May | 56°F | 75°F | 65°F | 5.8" |
| June | 66°F | 85°F | 75°F | 5.7" |
| July | 69°F | 89°F | 78°F | 5.7" |
| August | 67°F | 88°F | 77°F | 4.7" |
| September | 59°F | 80°F | 68°F | 3.6" |
| October | 47°F | 69°F | 57°F | 3.2" |
| November | 36°F | 56°F | 45°F | 2.0" |
| December | 25°F | 44°F | 33°F | 1.5" |
| Index | Olathe | Kansas | National |
| Air quality index | 47 | 47 | 42 |
| Pollution index | 5,311,910 | 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 | 0.050% |
| Benzene | 0.050% |
| Carbon Tetrachloride | 0.010% |
| Lead | 0.040% |
| Mercury | 0.040% |
| City | Population | Air Quality Index | National Avg. |
| Wellsville, KS | 1,921 | 41 | 18.0% |
| Cleveland, MO | 784 | 47 | 6.0% |
| Fairway, KS | 3,975 | 47 | 6.0% |
| Mission Hills, KS | 3,563 | 47 | 6.0% |
| Roeland Park, KS | 6,747 | 47 | 6.0% |
| Olathe, KS | 139,216 | 47 | 6.0% |
| City | Population | Air Quality Index | National Avg. |
| Orange, CA | 139,322 | 89 | 78.0% |
| Surprise, AZ | 139,007 | 74 | 48.0% |
| Roseville, CA | 138,860 | 52 | 4.0% |
| Trois-Rivières, QC | 138,766 | n/a | |
| Denton, TX | 139,734 | 51 | 2.0% |
| Olathe, KS | 139,216 | 47 | 6.0% |
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